The Helicarrier limped through the upper atmosphere. All four engines were technically online, but the main command deck was a smoking, shattered ruin. SHIELD engineers were working frantically to bypass fried circuits, extinguish localized electrical fires, and hold the massive flying fortress together.

Meanwhile, the Avengers had gathered in the medical bay, trying desperately to fix a very different kind of broken system.

Clint Barton lay strapped to a reinforced steel gurney. His wrists and ankles were bound in heavy tactical restraints. His body had been chemically sedated by the medical staff, yet his eyes were still glowing with that terrible, icy blue cosmic light beneath half-closed lids.

Natasha stood completely motionless at his side. Her face gave away absolutely nothing. Her knuckles, however, were bone-white where she gripped the metal bed rail.

Tony leaned casually against the far wall, arms folded over his chest, his suit powered down. Steve sat stiffly on a medical bench with a cold pack pressed to his bruised ribs. Banner occupied a chair in the corner, looking simultaneously exhausted and oddly peaceful. Thor stood by the window, Mjolnir resting on the floor at his feet.

Nobody spoke for a long time. The only sound in the room was the steady beep of Barton’s heart monitor and the distant grind of repair crews welding hull breaches shut.

Tony broke first. He never liked quiet unless he was working alone in his lab.

"So. Options." He nodded toward Barton. "Point Break, you’re the resident expert on your brother’s party tricks. How do we undo this?"

"Loki has never shown powers of mental control like this," Thor rumbled, crossing his massive arms. "This is complex mind magic, amplified by a relic I do not fully understand. However, in times past, when one of our warriors fell under an enchantment, I would call the storm and let Mjolnir’s lightning burn the foreign magic away. I could attempt the same here."

"No lightning on my agents," Fury ordered flatly from the doorway.

"What about blunt force trauma?" Tony suggested brightly. "A solid smack to the head from our green friend might knock the alien programming right out of his skull."

Banner looked up. A faint, tired smile crossed his face. "The Other Guy is very willing and incredibly eager to give it a try."

Several people glanced nervously toward Banner, who simply shrugged.

"No." Natasha’s voice was quiet, but it carried a lethal edge that shut down the entire room. She turned to the disguised elf standing near the heart monitors. "Winky. Can you fix him? Please."

Winky stepped forward and placed one small hand on Barton’s forehead. Silver light glowed faintly around her fingers. She held the contact for a long moment, her eyes half-closed in deep concentration.

Then she pulled away and shook her head sadly.

"Winky cannot fix this," she said softly. "The magic in his head is very deep and very dark. Winky has not learned the mind magic needed to remove it safely without hurting him."

"Who has?" Fury stepped fully into the room.

"Master Hayes. But Master is not here right now."

A heavy silence fell over the medical bay.

"I could take him to Asgard," Thor offered. "Perhaps the royal mages could successfully purge the corruption. But it would take days of travel and ritual, and the outcome would be far from certain."

"Days we do not have," Fury said grimly.

Natasha looked at Fury. Fury looked at Winky.

"Is there anyone else on this planet," Fury said, each word measured and deliberate, "who can do what Arthur can do?"

Winky stood tall. "Winky will find help."

She popped out of existence.

She returned exactly forty-five seconds later with Sirius Black.

Sirius stood in the middle of the medical bay, casually brushing invisible dust from his tailored leather jacket. He took one lazy look at the battered Avengers, the smoking corridor visible through the open doorway, and finally, the unconscious SHIELD agent with glowing blue eyes.

"So, you are the famous muggle heroes," Sirius said brightly, looking around. "Arthur and the kids have told me a lot about you lot. Nice to finally put faces to the stories." He extended a hand toward Tony. "Sirius Black. Lord Black, technically, but only the insufferable purebloods care about the title."

Tony shook the offered hand. "Tony Stark. I’d say it’s nice to meet you, but we’re having a bit of a day."

"I can see that." Sirius surveyed the room with a practiced eye. The grin didn’t leave his face, but something sharper moved behind it. The casual ease of a man who had fought in a war, rebuilt a government, and married the terrifying woman who ran it. "Winky gave me the short version on the way. Loki, mind control, alien weapon. Arthur is off being mysterious. And you need someone who can pick a lock inside a man’s skull."

"Can you?" Fury asked directly.

"Only one way to find out."

Sirius knelt smoothly beside Barton. He drew his wand and performed a series of complex diagnostic charms. His movements were practiced and precise. His expression quickly shifted from casual irreverence to dark, focused concentration as he probed the Mind Stone’s influence.

After a full minute, he stood back with a heavy sigh.

"It is deep," Sirius said. His voice had lost all its lightness. "The tendrils of control are threaded through every single layer of his consciousness. Whoever designed this was brilliant in the worst possible way. It makes the Imperius Curse look like a polite suggestion box. I am sorry, but I cannot help him."

Natasha’s posture stiffened noticeably.

"It is too risky," Sirius explained, running a hand through his dark hair. "One mistake from me could permanently scramble his brain into porridge. You need someone with significantly stronger, much more precise Legilimency than mine, and I honestly do not know if anyone in Britain is up to the task."

"Arthur did it a few days ago on another controlled scientist," Fury said.

Sirius raised an eyebrow. "Of course he did. That man collects impossible achievements the way other people collect shells." He paused. "But Arthur is off doing whatever Arthur does when he vanishes at the worst possible moment, and I don’t have his precision with this kind of work."

"Is there no one else in your hidden world?" Fury’s voice carried the edge of a man running out of options.

Sirius hesitated. The hesitation was visible and entirely uncharacteristic. Sirius Black simply did not hesitate.

"There is one person," Sirius said carefully. "One person whose Legilimency might be precise enough to thread through this without tearing everything apart."

"Then bring him in."

"You don’t understand." Sirius’s expression did something complicated. "He is not a good man. I don’t even know if he will agree to help. And if he does, you will actively want to throw him off this flying ship within thirty seconds of meeting him."

Natasha’s gaze was steady. "Can he save Clint?"

"Maybe. Possibly. He’s the only person I’d trust with this kind of surgery, and I trust him about as far as I can throw Hogwarts Castle."

"Then try," Fury said softly. "Please."

Sirius studied Fury’s face for a long moment. Something in the director’s clipped, no-nonsense delivery seemed to click. A slow, knowing smile spread across his face.

"You know what, Director? You two are going to get along famously. He’s the same breed of charming."

Sirius looked at Winky. The elf looked back.

"Winky," Sirius said, his voice carefully neutral. "Can you fetch Snape? He should not be hard to find. His private potions business is doing very well these days."

Winky tilted her head. "The greasy potions man?"

Tony snorted. Steve looked confused. Thor looked mildly interested.

"Yes, Winky. The greasy potions man." 𝒻𝓇𝑒𝘦𝘸𝑒𝒷𝓃ℴ𝑣𝘦𝑙.𝒸ℴ𝘮

Winky popped away.

—

Ten minutes passed in agonizing silence. Then Winky reappeared.

Beside her stood a tall, incredibly pale man in immaculate, billowing black robes. He had lank, dark hair, a sharp hooked nose, and an expression of absolute, withering contempt for everything in the room.

His cold, black gaze swept the high-tech medical bay dismissively. It settled immediately on Sirius. Neither man moved for a long moment.

"Black." Snape’s voice was low, smooth, and perfectly even. "I did not expect to see you again."

Sirius straightened his posture. "The feeling is mutual. I would have much preferred to see you rotting in a cell in Azkaban."

"And yet here I stand. Free. Comfortable. Highly successful."

Fury cleared his throat. Snape’s dark eyes moved to the director. Something shifted in his expression. Not respect, exactly. Recognition. One spy acknowledging another.

"You were a Death Eater," Fury stated. Not a question.

"I was a spy inside an organisation of Death Eaters," Snape corrected, without a trace of defensiveness. "A distinction that twelve years of service, thirty-seven confirmed convictions based on my testimony, and a full pardon from the Minister of Magic should make abundantly clear." His gaze flicked to Sirius. "Though some people find nuance difficult to grasp."

Sirius’s jaw tightened. "You sat out the final battle, Snape. Children fought and died. And you sat comfortably in your quarters with the door securely locked."

"My cover required it. I was a spy whose role was known to precisely three people, one of whom I had been ordered to kill to preserve that cover." Snape’s voice did not rise. "The tribunal found my reasoning sound. Twice."

"Dumbledore." Sirius said the name like a knife. "The man who trusted you more than anyone alive. And you put him in the ground."

"At his own request. While he was already dying from a curse that would have killed him within months regardless." Snape paused, letting the silence do its work. "I have explained this. Under Veritaserum. To people far more qualified to judge than you."

"And I still don’t believe a single word of it," Sirius spat. "You didn’t fight that day because you’d already calculated which side was going to win. Voldemort had no chance against Arthur and you knew it. So you sat and waited."

Something moved behind Snape’s eyes. Cold. Honest.

"Perhaps." Snape turned away from Sirius with the finality of a door closing. "Show me the patient. I was told this was urgent."

He crossed the room in three long strides. Winky had explained the situation on the way. He did not need to be told twice.

Snape knelt beside Barton. The motion was precise, almost elegant, his black robes settling around him like a shadow finding its shape. He gripped Barton’s jaw with no gentleness at all, forcing the archer’s face toward him.

Barton’s blue-lit eyes snapped open under the contact. They stared, empty and hostile, into Snape’s bottomless black ones.

Snape held the gaze.

The room went very quiet.

What happened next was invisible to everyone except perhaps Thor, who frowned and leaned forward. There was no dramatic light show. No crackling energy. Just Severus Snape staring into a man’s eyes with an intensity that made the air feel heavier.

Natasha watched. She could see the tendons in Snape’s neck tighten. She could see the faintest sheen of sweat appear on his temples. Whatever he was doing, it was not easy. But his hands were rock-steady, and his breathing never changed.

Thirty seconds passed.

Barton’s body went rigid. His back arched against the restraints. A strangled sound escaped his throat.

Forty seconds.

Snape’s lip curled. Not in contempt this time. In effort. In the focused, savage determination of a man driving a blade through something that did not want to be cut.

Fifty seconds.

The blue light behind Barton’s eyes flickered. Stuttered. Flared once, bright and desperate, like a dying flame reaching for air.

Then it shattered.

The glow drained from Barton’s eyes like water through cracked glass. His body went limp. His breathing hitched, caught, and settled into a ragged rhythm. His eyes were brown. Weary, confused, frightened brown.

Snape released his jaw and stood in a single fluid motion. He pulled a black handkerchief from his sleeve and wiped his hands with deliberate care.

"Done."

"Nat?" Barton’s voice was raw and cracked. "Romanoff?"

Natasha’s hand found his shoulder. "You were compromised. An alien weapon overrode your mind. You were not in control."

"What did I do?"

"Nothing that cannot be fixed. Lie still."

Barton’s tired eyes drifted across the room. They stopped on the tall man in black robes.

"Who is that?"

"The man who just saved your mind."

Barton blinked. "He looks like he hates everyone in this room."

"He does. Lie still."

Snape was already moving toward the door, entirely uninterested in gratitude. He paused at the threshold and turned back to Fury.

"The enchantment was extraordinarily complex," Snape instructed coldly. "Your agent will have severe migraines for several days. Fragmented memories of his actions will surface gradually. Some will be highly unpleasant. He will recover. The human mind is far more resilient than simpletons give it credit for."

Fury nodded once. "Thank you."

Snape then looked at Sirius. "Black. I expect my payment delivered in exactly two days."

Sirius blinked, taken aback. "What payment? We didn’t discuss any payment."

"Did you honestly think I crossed the ocean and came here to help out of the sheer goodness of my heart?"

Sirius shook his head slowly.

"Good. Then we understand each other." Snape folded his hands behind his back. "I have heard, through channels I see no need to disclose, that your people have successfully recreated the wizard’s staff. I want one made for me."

Sirius froze. "What! How do you know about the staffs? Amelia kept that strictly classified."

Snape just sneered, a look of pure, insufferable superiority. There was absolutely no need to explain how a master spy gathered his information.

"Two days, Black."

"Winky, please take me back to my shop," Snape said, turning his back on them to look at the elf.

"Winky will take the greasy potions man home," Winky said pleasantly.

Snape closed his eyes. Drew a slow breath through his nose. Turned his head toward Sirius.

"Black. Control your people."

"She’s Arthur’s elf, not mine," Sirius grinned, wide and wolfish. "And if you have any problem with what she calls you, I highly suggest you take it up directly with her master."

Snape’s left eye twitched visibly. He said absolutely nothing more. Winky popped him away without ceremony.

Sirius looked at Fury. "I hate that man."

"He just fixed my best agent in under three minutes," Fury stated.

"I know." Sirius stretched his legs out. "I have hated him for thirty years. I intend to continue."

"Your personal feelings are noted and completely irrelevant."

"See? Exactly what I said. You two are the same person in different packaging."

Tony looked thoughtfully at the empty space where Snape had been standing. "I liked him."

Every head in the room turned to stare at the billionaire.

"What?" Tony shrugged. "He walked in, hated everyone equally, fixed the problem, and left. That’s efficiency. I respect efficiency."

"You would," Steve said.

—

An hour later, the team gathered around a portable tactical table that had been dragged into the center of the medical bay. Glowing holographic displays flickered above its surface, fed directly by JARVIS through the Helicarrier’s surviving data feeds.

"So. An alien invasion," Sirius said, leaning heavily on the table and studying the display with the air of a man who had seen extraordinary things and was simply adding another to the list.

"An alien invasion," Fury confirmed grimly. "We know the Chitauri army is coming. What we do not know is where."

Banner rubbed his forehead. "Since they are dropping straight from deep space, can we do anything at all without planetary orbital defenses? They could easily branch out and attack everywhere at once. We cannot be in every city."

Thor shook his head. "That is not Loki’s way. My brother craves grand spectacle. He will not scatter his forces across the globe like seeds in a field. He will choose one place. One battle. One decisive stroke." Thor’s voice carried the quiet certainty of someone who had watched his brother’s ambitions play out across centuries. "Loki believes that if the heart falls, the body follows. He will strike at whatever he considers the heart of your world."

"That’s something," Tony said. "Not much, but something. Otherwise, we’d be looking at years of apocalyptic whack-a-mole."

"He wants an audience," Steve said, straightening. "He wants the world watching when his army comes through. That means a major, heavily populated city. Somewhere visible. Somewhere symbolic."

"That narrows it to about forty cities," Banner said. "But better than nothing."

Sirius leaned forward. "Amelia has a force ready. Wizards, Aurors, trained combat teams. We have been preparing for something like this since Arthur first warned us years ago. But my people move by Portkey. If the distance is intercontinental, we need lead time to prepare the transit points." He looked at Fury with the calm directness of an equal, not a subordinate. "You tell us where, we can have people in position within hours."

"And if we can’t tell you where?" Fury asked.

"Then we’re guessing. And guessing against an invasion isn’t strategy." Sirius’s face was no longer smiling. "It’s prayer."

Silence settled over the table. The holographic display rotated slowly, showing a global map dotted with potential targets. Too many dots. Too many unknowns.

Then a harsh, completely alien chime cut through the quiet.

Fury reached into his coat and pulled out an object that made everyone except Thor stare. A small device of dark, brushed alien metal that glowed faintly along its smooth edges. It looked nothing like any human technology in the room. Steve stared at it. Banner leaned forward with open curiosity. Tony’s eyes narrowed with the particular hunger of an engineer seeing hardware he could not immediately reverse-engineer.

Fury looked at the caller display. His expression shifted. Just a fraction of an inch, but everyone in the room caught it.

"We might not have to guess," Fury said.

He answered the call.