Here’s the thing about advanced alien civilizations. They’ve got faster-than-light travel. They’ve got energy shields. They’ve got weapons that can crack planets like eggs.

What they don’t have, apparently, is a decent immune system.

The Scourge had a name in about four hundred different languages, but everyone just called it the Scourge—because when you’re watching entire star systems go dark, you don’t really have time for proper nomenclature. It started somewhere in the Andromeda sector. Or maybe it was the Triangulum arm. Honestly, the records got a bit fuzzy when civilizations started collapsing faster than you could update a database.

The thing was elegant in its simplicity. It was a virus, or a bacteria, or maybe a prion. Nobody could quite agree, because by the time you finished analyzing it, you were already dead. It spread through air, through water, through the cold vacuum of space like it was on a personal mission from the universe itself. Incubation period: six hours. Mortality rate: 99.9%.

That last 0.1%? They wished they were dead.

A thousand worlds. A thousand entire planetary civilizations—gone. Quarantined, evacuated, or simply left as cosmic graveyards with populations that went from billions to zero in the time it takes to binge-watch a mediocre streaming series.

Commander Vexus of the Thelonian Empire stood in the Galactic Council chambers and tried very hard not to think about the fact that his species had survived three major galactic wars and was now being taken out by something they couldn’t even see without a microscope. He was tall, blue, and had approximately six too many eyes for comfort—which meant he could watch the entire council panic in high definition from multiple angles simultaneously.

“We have exhausted all options,” announced Councilor Prime Jara, who looked like a crystalline spider had a baby with a disco ball. Her voice echoed through the chamber with all the gravitas of someone announcing the end of the world—which, to be fair, she basically was. “Every cure we’ve attempted has failed. Every quarantine protocol has been breached. We are out of worlds to evacuate to.”

“What about the Outer Rim territories?” someone asked. It might have been the Krellian ambassador. Hard to tell when everyone was wearing environmental suits because nobody trusted the air anymore.

“Infected,” Jara said flatly. “The sanctuary stations? Infected. The penal colonies? Infected.” She paused. “And frankly, they had it coming, but still—infected.”

Vexus cleared his throat, which sounded like gravel in a garbage disposal. “There is one option we haven’t considered.”

The entire council turned to look at him, which was deeply uncomfortable when you’re talking about forty different species’ worth of eyes.

“The Sol system,” he continued. “Third planet. Earth.”

The silence that followed could have suffocated a supernova.

“You want us to go to the *human* world?” Jara’s voice dripped with the kind of disdain usually reserved for expired food products. “The primitives who only just discovered faster-than-light travel? The ones who still use fossil fuels on half their planet?”

“Those humans.” Vexus didn’t flinch. “They’re isolated. They’re unremarkable. And more importantly—they’re uninfected. We establish a quarantine zone there. We warn them about the Scourge. They panic appropriately and hide in their primitive bunkers, and we use their planet as a staging ground for research.”

“This is what we’ve come to,” muttered someone in the back. “Asking apes for help.”

But desperation makes people do funny things. And when your alternative is extinction, even apes start looking pretty good.

The vote passed—barely—with the kind of enthusiasm you’d expect from a council voting on which cliff to drive off of. Vexus was put in charge of the Earth operation, because apparently surviving this long meant he got all the terrible jobs nobody else wanted.

He stood in his ship’s command center, looking at the blue-green marble of Earth floating in space, and wondered if humans had any idea how much their very average Tuesday was about to get complicated.

“Send the transmission,” he ordered. “Universal common language, all frequencies. Warn them about the Scourge.”

His communications officer, a young Thelonian named Cricks who still had hope in his eyes—poor kid—sent the message. It was a good message. Very dramatic. Lots of warnings about imminent doom and the end of civilization and please prepare for evacuation procedures.

They waited for the response.

And waited.

“Sir,” Cricks said slowly. “We’re receiving a reply.”

“Put it through.”

A voice came through the speakers. Male. Human. And carrying the distinct tone of someone who had exactly zero coffee in their system and even less patience for whatever fresh nonsense the universe was throwing at them today.

*“Yeah, hi. This is Dr. Marcus Webb with the CDC in Atlanta. Got your message about the space plague. Quick question: is this real, or is this Jerry from Accounting with the ham radio again?”*

Vexus stared at the communications panel. Cricks stared at Vexus.

“Did he just—” Cricks began, “did he just compare our galaxy-ending crisis to someone named *Jerry*?”

Vexus had a sinking feeling that this was going to be a very long assignment.

Dr. Marcus Webb was having a day. Not a good day, not a bad day—just *a* day, which in his line of work was actually pretty close to a miracle. He was fifty-two, looked sixty-five, felt eighty, and had the kind of permanent exhaustion that comes from spending three decades explaining to people that yes, you should wash your hands, and no, essential oils are not a substitute for vaccines.

The alien transmission had come through at approximately zero-dark-thirty in the morning, which was right about when Marcus was contemplating whether his coffee maker qualified as a dependent for tax purposes.

“So, let me get this straight,” Marcus said into the microphone, talking to literal aliens from space because apparently that was his life now. “You’ve got a plague. It’s killed a thousand worlds. And your plan is to come *here* and use Earth as a quarantine zone?”

“Correct,” said Commander Vexus. And Marcus had to give the alien credit—he sounded about as thrilled with this plan as Marcus felt about it. “We thought it prudent to warn you so you could begin evacuation procedures.”

Marcus took a long sip of coffee. Then another. Then he seriously considered just drinking the entire pot.

“Commander Vexus, is it? Let me tell you about Earth. See, we’ve got a bit of a history with plagues. There was this thing called the Black Death—killed about half of Europe. Then we had Spanish flu—that was a fun time. Smallpox, polio, tuberculosis, malaria’s still kicking around. We had COVID-19 a few years back—that was a whole thing.” He paused. “And there was this incident in Cleveland in 2013 that we don’t talk about, but it involved a contaminated batch of energy drinks. And that’s all I’m legally allowed to say.”

“I do not understand the relevance,” Vexus said.

“The relevance,” Marcus said, “is that Earth doesn’t *evacuate* for plagues, Commander. We make documentaries about them.”

He could hear what sounded like confused chittering on the other end of the line.

“We’re going to need samples of this Scourge thing,” Marcus continued. “And some medical data on the species it’s affected. Also, what’s your species’ equivalent of white blood cell count? Do you have white blood cells? Do you have *blood*?”

“You want to *study* it?” Vexus sounded genuinely baffled. “This is a civilization-ending pathogen.”

“Yeah, well, we’ve got a civilization that’s really bad at ending. Hang tight. I’m calling in my team.”

Marcus hung up on the alien commander—which he suspected was some kind of intergalactic faux pas, but he’d apologize later. Maybe. If he felt like it.

He made three phone calls.

The first was to Dr. Ko Tanaka, who ran the immunology department at Johns Hopkins and had exactly zero tolerance for nonsense. She answered on the first ring.

“This better be good.”

“Aliens are real, and they’ve got a space plague.”

A pause. “I’ll be there in three hours. I’m driving, so make decent coffee for once in your miserable life.”

The second call was to Dr. Brett Morrison, a virologist who’d made his name during the COVID-19 pandemic by live-streaming his research and somehow making infectious diseases entertaining. He was thirty-five, had the energy of a golden retriever who’d just discovered coffee, and treated every crisis like it was an Olympic sport he was determined to medal in.

“Yo, Marcus, what’s up?”

“How do you feel about alien pathogens?”

“I feel like that’s either a really weird prank or the best Tuesday I’ve had all month. I’m in.”

The third call was to his boss, Director Patricia Alvarez, who had been running the CDC through multiple administrations and had the kind of unflappable calm that came from dealing with politicians—which was arguably worse than dealing with plagues.

“Marcus, it’s four in the morning.”

“Aliens contacted us about a galaxy-ending plague and want to use Earth as a quarantine zone.”

A pause. “Do we have funding for this?”

Marcus loved his job sometimes.

By the time Vexus’s ship landed at the CDC facility in Atlanta, Marcus had assembled his team, requisitioned a lab, and filled out approximately forty-seven forms. Because even during an alien plague situation, bureaucracy was eternal.

Vexus came down the landing ramp expecting fear. Maybe some awe. At minimum, some respect for the gravity of the situation. What he got was Marcus Webb holding a clipboard and wearing a t-shirt that said *I survived the pandemic and all I got was this lousy immune system upgrade.*

“Commander,” Marcus said. “Welcome to Earth. We’ve prepared a sterile lab environment for the samples. Also—do you guys eat food? We’ve got sandwiches.”

Vexus looked at Ko, who was leaning against a wall and examining her fingernails with the expression of someone supremely unimpressed with the universe. He looked at Brett, who was literally bouncing on his heels with excitement. He looked back at Marcus.

“You people are insane,” Vexus said.

“Yeah,” Marcus agreed. “But we’re still here, which is more than your thousand worlds can say.” He gestured toward the facility. “Now, about those samples.”

Ko pushed off the wall. “I’ve been reviewing the data you sent ahead. Your species has an adaptive immune system, right? B-cells, T-cells, the whole gang?”

“Yes,” Vexus said slowly.

“And this Scourge thing—it attacks the respiratory system initially, then goes systemic.”

“Correct. Mortality rate of 99.9% across all species tested.”

“Unfortunately, yes.”

Ko looked at Marcus. Marcus looked at Brett. Brett grinned like a maniac.

“Oh,” Brett said, “this is going to be *fun.*”

Vexus felt his chances of survival drop significantly—and not because of the Scourge.

The thing about Brett Morrison was that he’d spent his entire career studying things that could kill him. So when Marcus asked for volunteers to be exposed to the Scourge, Brett’s hand shot up so fast he nearly dislocated his shoulder.

“Absolutely not,” Ko said immediately.

“Absolutely yes,” Brett countered. “Come on, we need human data. And I’ve got the best immune system in this building.”

“Remember the cafeteria incident?”

“We agreed never to speak of the cafeteria incident.”

“My point exactly.”

“I ate three-week-old sushi from a vending machine and didn’t even get a stomach ache. I’m practically indestructible.”

Marcus rubbed his temples. “Brett, this thing has killed *billions* of aliens.”

“Yeah, but I’m not an alien. I’m a human. We’re built different.” Brett was already rolling up his sleeve. “Besides, YOLO is apparently still a thing we say. I checked with the interns.”

“That’s not reassuring,” Vexus said. He’d been observing the humans for six hours now and had developed a stress headache—which was impressive, considering Thelonians didn’t usually get headaches. “This is perhaps the most dangerous pathogen in galactic history.”

“Cool,” Brett said. “You guys got it in a syringe, or do I need to like, lick a petri dish? Because I’ll do it, but I’d prefer the syringe.”

Twenty minutes later, Brett Morrison became the first human to be deliberately infected with the Scourge—because apparently Earth’s defense strategy against cosmic horror was spite and poor impulse control.

They set him up in a quarantine room with full monitoring. Vexus watched through the observation window with the kind of morbid fascination usually reserved for watching someone juggle chainsaws.

“How long until symptoms appear?” Marcus asked.

“In every species we’ve tested—six hours until initial symptoms. Twelve hours until death,” Vexus said quietly.

Ko was already at her workstation, monitoring Brett’s vitals and blood work in real time. “Okay, the Scourge is in his system. I can see it on the scan. It’s heading for his respiratory tissue.”

Hour one: Brett played video games on his phone.

Hour two: Brett complained about being hungry.

Hour three: Brett took a nap.

Hour four: The Scourge reached Brett’s lungs and encountered his immune system.

If you could have zoomed into the cellular level—which Ko’s very expensive equipment was doing—you would have witnessed something that looked less like an infection and more like a bar fight. The Scourge, which had steamrolled through a thousand species’ immune systems like they were made of tissue paper, hit Brett’s antibodies and immediately discovered that human immune systems don’t play defense.

They play extremely aggressive offense.

“Oh my god,” Ko breathed, staring at her monitors. “His T-cells are multiplying like crazy. His antibodies are marking the Scourge faster than it can replicate. It’s like watching a shark meet a school of piranhas.”

“What is happening?” Vexus demanded.

“His immune system is winning,” Marcus said, sounding shocked. “It’s not even close.”

The Scourge tried to attach to lung cells. Brett’s immune system said *absolutely not* and deployed what could only be described as cellular bouncers. The Scourge tried to go systemic. Brett’s antibodies hunted it down like it owed them money. The Scourge attempted to mutate. Brett’s adaptive immune system adapted faster—because apparently millions of years of fighting Earth diseases had created an immune response that was basically an overachieving psychopath with a grudge.

Hour five: Brett woke up from his nap.

Hour six: Brett’s temperature was elevated by 0.7 degrees.

“How are you feeling?” Marcus asked through the intercom.

“Bit warm,” Brett said, stretching. “Kind of tired.” He paused. “Are we still doing Taco Tuesday in the cafeteria? Because I’m not missing Taco Tuesday for space flu.”

Vexus stared. Just stared.

“His symptoms,” the commander said slowly, “are equivalent to what you would call a common cold.”

“Mild cold,” Ko corrected, still watching her screens in fascination. “I’ve seen worse responses to seasonal allergies. His immune system just identified the Scourge, catalogued it, mass-produced antibodies, and is currently hunting down the last remaining viral particles like it’s playing Whac-A-Mole.” She shook her head. “This is the most aggressive immune response I’ve ever seen outside of an autoimmune disorder.”

“But it has killed *billions,*” Vexus repeated, because his brain was having trouble processing this.

“Yeah, of aliens,” Brett called from quarantine. “No offense, Commander, but what kind of weak-sauce immune systems do you guys have? This thing’s not even making me sneeze.”

Marcus pulled up the comparative data. Earth’s disease history: the Black Death, Spanish flu, smallpox, tuberculosis, cholera, typhoid, dengue fever, COVID-19. The Cleveland incident—which the file said was classified but included the phrase *never combine taurine with experimental probiotics.*

“Oh,” Marcus said softly. “Oh, *that’s* why.”

“Why? What?” Vexus asked.

“Earth is a disease factory, Commander. We’ve been fighting plagues since before we crawled out of the oceans. Our immune systems didn’t evolve to fight off the occasional infection. They evolved in an environment where *everything* is constantly trying to kill us on a microscopic level. Bacteria. Viruses. Fungi. Parasites. Prions.” Marcus paused. “We’ve got enemies we haven’t even named yet. Our immune systems are in a permanent state of paranoid aggression.”

Ko nodded slowly. “We’re not tougher than you, Commander. We’re just more traumatized. On a cellular level.”

Brett pressed his face against the quarantine window. “So, does this mean I can get tacos or what?”

“Absolutely not. You’re staying in there for another eighteen hours,” Marcus said. Then, softer: “But Brett?”

“Yeah, boss?”

“Nice job not dying.”

“Thanks. I’ve been practicing for years.”

Vexus sat down heavily—which was hard to do gracefully when you had six legs. “You’re telling me that humans might be *immune* to the Scourge because your planet is essentially a biological war zone?”

“Immune is a strong word,” Ko said. “Resistant is more accurate. But yes—essentially, the Scourge just picked a fight with the one species in the galaxy that spent its entire evolutionary history in the cosmic equivalent of a maximum-security prison where all the inmates are microscopic and extremely angry.”

“This is impossible.”

Marcus handed him a cup of coffee. “Commander, let me tell you about Earth. ‘Impossible’ is just Tuesday here.” He pulled up a new display. “Now, let’s talk about how we’re going to weaponize this.”

In his quarantine room, Brett Morrison sneezed once—killed the last Scourge particle in his system—and went back to playing video games.

The galaxy’s deadliest plague had just met its match. And it wore a lab coat and complained about missing Taco Tuesday.

“So, here’s the thing about human blood,” Marcus said, standing in front of a holographic display showing approximately forty different alien species’ biology. “You guys are probably not going to like it.”

Vexus had called in every medical expert still alive from the surviving species. They filled the emergency council chambers—which had been hastily set up on Earth because everywhere else was either infected or evacuated. The air was thick with desperation and the smell of whatever passed for stress sweat in sixteen different biologies.

“Dr. Webb,” Councilor Prime Jara said, her crystalline surface flickering with anxiety. “If you have a cure, we need it now. We’ve lost three more colonies in the last rotation.”

“Right. So, cure,” Marcus said. “We’ve got human plasma transfusions. Brett’s blood specifically contains antibodies that absolutely demolish the Scourge. We’ve tested it on samples from twelve species so far. It works every time.”

The chamber erupted in relieved chatter.

“However,” Marcus continued—and the room went silent—“there’s a catch.”

“What kind of catch?” Vexus asked wearily.

Ko stepped forward, pulling up a molecular diagram. “Human antibodies are, to put it scientifically, *absolutely feral.* They’re aggressive. They’re persistent. And they don’t play well with others. When we introduce human plasma into alien bloodstreams, it cures the Scourge. But the side effects are significant.”

“How significant?” someone asked.

Brett—who was now out of quarantine and wearing a t-shirt that said *I survived the Scourge and all I got was this lousy t-shirt*—raised his hand. “So, we tested it on a volunteer from the Krellian delegation. Good news: cured in three hours. Bad news: he spent two of those hours vomiting and described the experience as, quote, ‘drinking liquid fire mixed with regret.’”

“Your immune system is toxic to us,” Vexus said.

“Not toxic,” Ko corrected. “Just *extremely aggressive.* Think of it like this. Your immune systems are like mall security guards. Polite. Follow the rules. Wait for backup. Human immune systems are like that one guy who got banned from every bar in town but keeps showing up anyway. We get results, but the process is messy.”

Marcus pulled up more data. “We’ve documented the side effects across multiple species. Nausea. Fever. Temporary paralysis of secondary organs. Hallucinogenic episodes. Spontaneous molting in species that don’t normally molt.” He paused. “And in one memorable case, the patient’s skin turned purple for a week.”

“But they *lived,*” Vexus said.

“They lived,” Marcus confirmed. “Every single one. Zero mortality. The Scourge was completely eliminated from their systems.”

The council chamber filled with urgent whispers. Marcus could see the calculation happening behind dozens of different types of eyes: die from the Scourge, or suffer through human blood and live.

“There’s more,” Ko said. “We can’t produce enough human plasma for a thousand worlds’ worth of infected patients. We’d need every human on Earth to donate daily for the next ten years—and that’s assuming the antibodies remain stable outside the body, which they don’t.”

“So, what’s your solution?” Jara asked.

Marcus grinned. It was not a comforting grin. “We make synthetic versions. I’ve got a team working on isolating and replicating the specific antibodies. Give us two weeks and access to your medical manufacturing facilities, and we can produce enough synthetic human antibodies to cure a galaxy.”

“Synthetic?” Vexus said slowly. “You can do that?”

“Commander, we’ve been genetically engineering insulin for decades. This is just insulin’s angry, overachieving cousin.”

Brett leaned forward. “Also, I’m starting a betting pool on which species handles the treatment worst. Thelonians are currently at five-to-one odds because Vexus dry-heaved when we showed him a blood sample.”

“I did *not* dry-heave.”

“You absolutely did, dude. I got it on video.”

The council voted. It wasn’t unanimous. There was a vocal minority—led by Ambassador Quellix of the Arxian Collective—who argued that accepting help from primitive humans would damage their standing as advanced civilizations. But when your alternative is extinction, pride becomes negotiable.

Mostly negotiable.

“This is humiliating,” Quellix announced. He looked like an iguana had a baby with an accountant, and neither parent wanted custody. “We are the Arxian Collective. We have existed for ten thousand years. We are not going to be saved by a species that still uses *combustion engines.*”

“Cool,” Brett said. “More treatment for everyone else, then.”

“Ambassador Quellix,” Vexus said, trying for diplomacy, “I understand your concerns. But we’re out of options.”

“I refuse,” Quellix said. “The Arxian Collective will find our own cure. We will not be beholden to these—these *plague monkeys.*”

Marcus shrugged. “Your funeral, buddy. Literally.”

Ko was already coordinating with alien medical facilities. “We’ll need your manufacturing specs, your medical protocols, and someone who can explain how your distribution networks work without using the phrase ‘quantum entanglement,’ because that doesn’t help me get medicine to patients.”

“I’ll assign my staff,” Vexus said. He looked at Marcus. “Thank you. I know I don’t say it enough, but—thank you.”

“Thank me when this is over,” Marcus said. “Right now, we’ve got a galaxy to save, and I need about six pots of coffee to make it through the next week.”

The manufacturing process was insane.

Humans had never scaled up medical production to intergalactic levels before—mainly because they’d never needed to. And it turned out that when you tried to explain pharmaceutical protocols to species that communicated through bioluminescence or telepathic fungi spores, things got complicated fast.

But it worked. Slowly, painfully, with approximately eight thousand minor disasters and three major ones—it worked.

The synthetic antibodies rolled out across the surviving worlds. The reactions were exactly as promised: universally horrible, but not fatal. Patients recovered from the Scourge, spent a few days wishing they were dead from the side effects, then made full recoveries.

Brett’s betting pool became a viral sensation across multiple alien social networks—which apparently existed and were exactly as chaotic as human social media. He started posting recovery videos, documenting the side effects with the enthusiasm of a nature documentary narrator.

*“And here we see the Tharvian patient experiencing temporary bioluminescence,”* Brett narrated, filming an alien who was glowing like a disco ball. *“This is not a normal Tharvian trait. But hey—at least they’re alive. Side effects include looking like a rave in progress and an inexplicable craving for what humans call ‘citrus fruits.’ Ten out of ten, would cure again.”*

Vexus found himself becoming Earth’s unofficial liaison, which meant he spent most of his time explaining to various alien governments that yes, the humans were weird; no, that wasn’t going to change; and yes, they had to accept the treatment or die. So, pick one.

Three weeks into the mass treatment program, news came through that Ambassador Quellix had been infected with the Scourge. He refused treatment for four days—right up until his organs started failing.

He took the synthetic antibodies on day five. Spent two days hallucinating about geometric shapes. Made a full recovery.

He never apologized. But he did stop calling humans “plague monkeys.”

So Marcus considered it a win.

The Scourge retreated. Not disappeared—that would take months of coordinated effort—but it went from galaxy-ending threat to manageable crisis. Planets started reopening. Evacuation fleets turned around. The Galactic Council reconvened in their original chambers, which had been thoroughly disinfected approximately forty times.

And Earth—the backwater planet that nobody had paid attention to—suddenly became the most important world in the galaxy.

Vexus stood in the CDC facility watching Marcus and his team work. They looked exhausted. They looked stressed. They looked like they’d aged ten years in three weeks.

They also looked like they’d do it all over again without hesitation.

“You know,” Vexus said, “when this started, I thought we’d be babysitting primitives while we did the real work.”

Marcus looked up from his computer. “And now?”

“And now I think Earth might not be as backward as we assumed.”

“Thanks,” Marcus said. “That’s almost a compliment.”

“Almost,” Vexus agreed.

Brett walked past carrying a box labeled *MORE SYNTHETIC ANTIBODIES—because apparently we’re just doing this forever now.* “Hey, Commander,” he called. “We still on for that interview? My followers want to know what it’s like getting saved by plague monkeys.”

Vexus sighed, which sounded like wind through a broken flute. “Yes, Brett. We’re still on.”

“Awesome. Also, quick question—do Thelonians eat pizza? Because we’re ordering pizza.”

“What is pizza?”

“Oh, buddy. You’re about to have your mind blown.”

The galaxy was saved by human immune systems, synthetic antibodies, and apparently pizza. Quellix remained a cautionary tale about pride and plasma—which Brett turned into a meme that spread across six solar systems.

And in a lab in Atlanta, Dr. Marcus Webb made a note in his files: *Saved galaxy. Remember to submit expense reports.*

Because even in the face of cosmic horror, bureaucracy was eternal.

Saving a thousand worlds turned out to be less about dramatic heroics and more about logistics—which was somehow both less glamorous and more exhausting than anyone had anticipated. Marcus stood in front of a three-dimensional star map that showed infection rates, treatment distribution, and approximately four hundred things that were currently on fire—metaphorically speaking, some literally. Space was complicated.

“All right, people,” he said to the assembled team of human and alien medical coordinators. “We’ve got the cure. We’ve got production up and running. Now we just need to get it to everyone who needs it without causing a panic, a political incident, or accidentally starting a war.” He paused. “How hard can it be?”

“Very hard,” said Dr. Yuki Ito, who’d been brought in to coordinate the human medical teams deploying across the galaxy. She was tiny, fierce, and had the organizational skills of someone who’d probably scheduled military invasions for practice. “We’ve got fifteen species that require different dosages. Eight that have religious objections to synthetic medicine that we need to work around. And the Krellians are insisting that their prince gets treated first—even though he’s not even infected yet.”

“Tell the Krellians that the prince can get in line like everyone else,” Marcus said. “We’re doing triage based on infection severity, not nobility.”

“I tried that. They threatened to declare war on Earth.”

“They can get in line for that, too.”

The deployment strategy was, in Marcus’s professional opinion, absolutely bonkers. They were sending human medical teams to alien worlds to administer treatment—which meant training humans on alien biology and training aliens on not panicking when humans showed up with needles.

The results were mixed.

The first deployment was to Tharvos Prime, a garden world with a population of two billion that was eighty percent infected. The human medical team consisted of six doctors, twenty nurses, and one extremely enthusiastic Brett Morrison, who’d insisted on coming along to document the process.

“Remember,” Marcus told them over the comm link, “be professional. Be courteous. And for the love of God, Brett—do *not* start another betting pool.”

“No promises, boss.”

The Tharvian population’s first reaction to humans was confusion. They were a tall, willowy species that communicated partially through pheromones, and they’d never seen anything quite like humans before. Their second reaction—after receiving treatment—was intense nausea followed by spontaneous color changes, because apparently human antibodies made Tharvians temporarily shift through the entire visible spectrum like broken mood rings.

“This is normal,” Dr. Jennifer Okafor assured a Tharvian patient who had just turned bright orange. “The color changes will stop in about six hours. You’re cured. You’re going to be fine.” She paused. “And yes, I know it feels like your organs are trying to escape through your skin. That’s also normal.”

The Tharvian made a sound like wind chimes in a hurricane.

*“She says the cure is worse than the disease,”* the translator device reported.

“Yeah, we get that a lot,” Jennifer said. “But you’re alive, so I’m calling it a win.”

Brett, of course, was filming everything. *“Welcome to day three of Operation Antibody Express. Today, we’re on Tharvos Prime, where the local population is discovering that human medicine is extremely effective and also kind of horrifying. This patient has just experienced what we’re calling the Rainbow Effect. Sir, on a scale of one to ten—how much do you regret being alive right now?”*

The Tharvian made another noise.

*“He says fifteen,”* the translator reported.

“That’s the spirit.”

The deployments continued. Each world presented new challenges. The Krellians required treatment in their royal palace, because apparently dying from plague was fine, but getting treated in a common hospital was unthinkable. The Arxians needed constant reassurance that human medicine wasn’t going to turn them into humans—which Marcus found vaguely insulting. The Gorthians, who were basically sentient rocks, required a completely different delivery method because they didn’t have bloodstreams.

“How do you cure a rock?” Marcus asked Ko during one of their daily coordination calls.

“Very carefully, and with a lot of calcium carbonate buffers,” Ko said. She looked exhausted. She’d been running the synthetic production facility for three weeks straight. “We’re essentially making the antibodies into a paste they can absorb through their mineral matrix. It’s working, but the Gorthians are complaining that they *itch.*”

“Rocks can itch?”

“Apparently. Who knew?”

The human medical teams developed a reputation. They were efficient. They were effective. And they had absolutely zero patience for nonsense.

When a Thelonian noble tried to cut the treatment line because of his rank, a nurse from Detroit named Ashley Rodriguez told him that she’d survived three gang shootings and a tornado, so he could sit down and wait his turn or she’d show him what human aggression really looked like.

He sat down.

When an Arxian official complained about the side effects being “undignified,” a doctor from Mumbai named Raj Patel told him that dignity was optional, but life was required. So, pick one.

The official took his medicine.

“Your species has no respect for authority,” Ambassador Quellix complained to Marcus during one of the council updates.

“We have plenty of respect for authority,” Marcus said. “We just respect staying alive more.” He paused. “Also—and I say this with all due professional courtesy, Ambassador—you literally refused treatment and almost died because you thought you were too important for human medicine. So maybe check the attitude.”

Quellix’s scales rippled with indignation. But he didn’t argue—mainly because he’d turned purple during his treatment, and Brett had made it into a meme.

By week six, the operation had treated over five hundred billion patients across three hundred worlds. The Scourge was still out there, but it was contained. Manageable. No longer the extinction-level threat it had been.

Ko’s synthetic antibody production had reached industrial scale. They’d set up facilities on twelve different worlds, each one churning out millions of doses daily. She’d even managed to develop a more stable version that reduced the side effects from *absolutely horrible* to *merely terrible.*

“The key is adjusting the molecular structure,” she explained to a group of alien scientists who’d come to learn the process. “Human antibodies are naturally aggressive. But if you modify the binding sites and add a buffer solution, you can reduce the inflammatory response by about forty percent.”

“This is revolutionary,” one of the scientists said. She was from a species that looked like a floating brain in a jar—which was honestly less weird than some of the others Marcus had met. “We’ve been studying immunology for centuries and never considered this approach.”

“That’s because your immunology is based on your biology,” Ko said. “Human immunology is based on surviving everything Earth could throw at us. Which turns out is a lot. We’re not smarter than you. We’re just more paranoid. On a cellular level.”

Brett’s social media presence had somehow made him a galactic celebrity. His videos—documenting the treatments, the side effects, and his general commentary on alien biology—had gotten billions of views across multiple species networks.

*“Today on Brett’s Intergalactic Medical Hour,”* he narrated into his camera, *“we’re visiting the Nexarian Hive, where the locals are finding out that human antibodies don’t care about your collective consciousness. This patient is experiencing what we call the Individuality Effect—where the treatment temporarily disrupts their telepathic link. Don’t worry, buddy. You’ll be back to hearing everyone’s thoughts in about twelve hours. Enjoy the silence while it lasts.”*

The Nexarian in question made a series of clicking sounds that the translator rendered as: *“This isolation is existentially terrifying. But I am no longer dying, so I suppose it is acceptable. Five stars. Would recommend.”*

“That’s the spirit,” Brett said cheerfully.

Marcus watched the deployment reports come in with a mixture of pride and exhaustion. His teams were performing miracles—but miracles were apparently exhausting when you had to do them several billion times.

Vexus had become something of a permanent fixture at the CDC facility. He’d essentially moved in, setting up a workspace in what used to be a storage closet and coordinating between Earth and the Galactic Council.

“Your teams are causing political incidents,” he told Marcus one morning.

“Good political incidents or bad political incidents?”

“That depends on your perspective. The medical staff you sent to the Valoran system told their planetary council that if they didn’t stop hoarding treatment for the wealthy, the humans would leave and take the medicine with them.” Vexus paused. “The council immediately implemented equal distribution. The common people are calling your staff heroes. The nobles are calling them terrorists.”

Marcus sipped his coffee. “I’ll take that as a win.”

“You should know that several governments are requesting permanent human medical advisers. They want to learn from your approach to disease management.”

“They want to learn how to be more aggressive.”

“They want to learn how to survive,” Vexus corrected. “Before the Scourge, we thought we were advanced. We had technology. We had knowledge. We had entire civilizations built on the assumption that we’d solved the major problems. Then a virus nearly wiped us out.” He shook his head. “And the species that saved us still uses *paper filing systems* in some of your hospitals.”

“Hey, paper doesn’t crash,” Marcus said defensively.

“My point,” Vexus continued, “is that you forced the galaxy to reconsider what ‘advancement’ means. It’s not just technology. It’s adaptability. It’s resilience. It’s having an immune system that treats every threat like a personal insult.”

Down in the lab, Ko was training a group of alien scientists on synthetic antibody production. One of them—a crystalline being from Jara’s species—raised what might have been a hand.

“Dr. Tanaka, I have a question about the human immune response. Why is it so aggressive compared to other species?”

Ko pulled up a holographic timeline of Earth’s history. “See this? This is about two hundred thousand years of human existence. Now watch what happens when I overlay known plague events.”

The timeline lit up like a Christmas tree. Red markers indicated disease outbreaks—and there were so many they practically obscured the timeline itself.

“Oh my,” the crystalline scientist said.

“Yeah,” Ko said. “We’ve had approximately one major plague event every fifty years on average.