I do not own Star Trek 2009, Supernatural, NCIS or NCIS: LA.

Despite Callen's damning words, Kirk managed to get a shower, food and a decent night's sleep without disruption. Los Angeles security officers were combing the Enterprise for the missing Walker and when Kirk finally rejoined the land of the living, he found Spock hungrily leading the hunt, dark green bruises and stiff movements only fuelling the flames. Spock didn't often get his ass handed to him and he wasn't going to let this one go.

Kirk sank into his captain's chair with a still-tired sigh of relief. Even if they hadn't found Walker, he had Gain and Starc in custody and the Enterprise was ready to head home. "Sir, report from Starfleet," Uhura urged and Kirk picked up the PADD, flipping through the data. The Enterprise crew knew something had gone down at Starfleet Command and that the Impala and Washington had handled it but beyond that, they really hadn't needed to know the details when they were all exhausted and tired.

He chuckled briefly. "Impala saves the day again." The command crew relaxed, hearing their captain at ease. All of them probably could have snuck a peek at Kirk's files but refused to do so out of respect for their captain. "Uhura, distribute the files throughout the ship so everyone can have a read at their leisure. I want Walker to know that the Corelians failed, I have his co-conspirators and this cute little charade of his is over."

Uhura nodded sharply and completed her task with no small amount of glee. After that, the morning went smoothly. Scotty put the Enterprise back together, apologizing to his beloved ship the whole while, the Los Angeles security sweeps were replaced by Enterprise personnel and the Los Angeles returned to her diplomatic relations two sectors over.

But the longer Kirk waited to hear that Cupcake had found Walker, the more uneasy he became. It was a niggling feeling, like a tribble chewing on your baby toe – harmless, hardly even annoying, but there nonetheless. He shifted in his seat for the umpteenth time and stared at the empty science station. If anyone could find Walker, it would be Spock. He rattled his fingers on the arm of his chair. If Kirk wasn't waiting for an admiral to call, he'd be out helping.

"Captain," Uhura said with infinite patience, "if the admiral calls, protocol demands that I inform him of the situation at hand." Kirk nodded absently and she rolled her eyes. For all of his quick thinking, her captain was still dense sometimes. "It would take me a minute, sir."

Kirk was confused but refused to admit it. "A minute."

"Approximately the amount of time it would take you, sir, to reach the bridge."

Oh. He understood now. And felt slightly stupid. "Right. Sulu, you have the conn." With that, the captain was gone off the bridge in a flash.

"Thank goodness," a rattled Chekov sighed and then clapped a hand over his mouth.

Secretly, everyone else on the bridge agreed with him.

Impala

"Well then," Dean said to no one and everyone all at once, rubbing his hands together. "We've saved the planet, exposed the bad guys, learned that the Enterprise is in one piece and all the admirals except possibly Pike and Vance hate our guts."

Ash rolled his eyes and nudged Cas. "Captain's always had a talent for understatement."

Dean shot his navigator a mild glare before turning to his brother. "Sam?"

"We're destined for the dark side of Gamma quadrant," Sam replied, "and we depart ASAP for a very important mission that I will create on our way. I think we're destined for Lima 8D21, famed for its beaches. They asked for a Starfleet ship to attend their treaty signing. It involves the aforementioned beaches, copious amounts of alcohol and lots of good food." Sam finished typing a long string of sequencing into his station and sat back with satisfaction. "No more buggy software on the ship, captain."

Dean grinned, swivelling back and forth in his chair like a kid. "Excellent. Let's get out of Dodge before someone decides we really do need court-martialling."

Los Angeles

Callen was busy apologizing to the rather understanding planetary leader when a burst of static over his comm had him frowning in confusion. "Excuse me," he said to the prime minister, who waved his tentacles obligingly. "Sam, come in," Callen barked, glancing up through the yellow sky towards the Los Angeles' general location.

There was no response.

He tapped his comm for immediate emergency beam up.

Nothing.

"Away team with me. We're leaving. Now."

Enterprise

Kirk was buried deep in engineering looking for places a paranoid, cornered IO would hide when the entire ship shuddered under him and alarms began to whoop. Kirk held his breath, hoping that was the end of it. The sounds of explosions didn't die away though, growing stronger until Kirk could hear the deadly hiss of atmosphere escaping even in the bowels of the ship, far away from the hull.

He extricated himself with all speed, darting to the nearest comm post. "Scotty, report!"

"Behind you, capt'n and we've got big problems," the engineer shouted, barrelling around the corner at full speed. "Sir, Walker just ripped the lady's hull open in six different locations and the holes are big enough that we're not going to get the sealing systems online in time."

"Get the affected decks sealed off! Uhura, distress call to any and all ships in the area. I don't care if they're Starfleet, Orion or Romulan, we're going to need atmosphere and soon! Is the Los Angeles in the area?"

"Not answering hails, sir," the communications officer replied, her voice muffled through an O2 mask. "We've got a minor atmosphere leak on the bridge as well. Sealant systems offline ship-wide."

Shit. "Hang in there Uhura and be prepared to abandon the bridge if necessary. Scotty?"

"On it, sir!"

"Bones!" Kirk demanded next.

"I'm busy!" the irritable CMO barked.

"Status of the infirmary?"

"Secure at the moment, Jim but the injured are pouring in. You're going to be running on a skeleton crew if this keeps up."

Kirk rubbed a hand over his face. "Bones, anyone with mild injuries is going to have to stay on duty. I need everyone I can get."

"Aye captain."

"Spock!"

"Attempting to affect repairs on deck eight sir," the first officer replied, his voice also muffled by an oxygen mask.

"Carry on then." Kirk stood silently for a minute, thinking. They hadn't found Walker. Los Angeles wasn't replying. There had been a lot of traffic between the Los Angeles and the Enterprise. If Kirk had to hazard a guess, he'd say that Walker was no longer on the ship. "Cupcake, what's the status of the brig?"

"I can't raise them, sir. Sounds like one of the smaller explosions was right near there."

"Small enough to bust open a cell door and allow Starc to overpower the guards?"

"Yes sir."

Damn. Double damn. "Lock down any and all laboratories and put a guard on the infirmary. Gain is most likely on the loose and I don't want her getting her mitts on any form of airborne disease."

Up on Deck 18, Cupcake scowled at the comm. The captain was probably right. He always was. His people were going to be spread awfully thin though, covering all the labs and the infirmary. "You heard the captain, move! Keep your eyes open and help out where you can but so help me if I find out that you let your guard down and Gain gets what she wants…" Cupcake's voice trailed off as his security personnel scrambled for the door. It wasn't often that their commander made threats but he always followed through and the ones he left hanging? You just didn't fail because you really didn't want to experience Cupcake's wrath.

Los Angeles

The natives had lent Callen a shuttle and he was now chugging his way up to his eerily silent ship, cursing the less-advanced craft he was currently piloting six ways to Sunday. Then the Los Angeles came into focus on the limited long-range scanners and Callen felt his heart drop down to somewhere around his ankles as the worried away team behind him tensed up even more.

She was venting a long silvery stream of atmosphere from the recreational decks. They were tucked back in a protected area of the ship, well shielded from exterior attack but from the inside it would be a simple job to plant several big charges along the hull and the rec-decks were a long way from anything that might be jury-rigged to seal up the breach.

"Los Angeles, come in. This is the captain." Callen tried again but the ship didn't respond. "Assume we're going in hot," Callen barked over his shoulder. Sam had been left in charge. If he and Hetty couldn't handle the situation, you could be damned sure that Callen would have it work cut out for him. In fact, he had deliberately taken a team of green newbies down with him to give them a little seasoning and it was showing right now in their wide eyes and pallid complexions. "Follow my lead and we'll be fine," he reassured, checking over his phaser and praying that he wasn't lying through his teeth.

Impala

They were halfway to their little working vacation when Sam started in his chair, having stumbled across an alarming message. "Red alert emergency from Enterprise, sabotage onboard, massive atmosphere venting," he reported with eerie, deceptive calm.

"Maximum warp," Dean ordered. They didn't need to hear anything else. "Sam, check on the Los Angeles."

The Impala whined in protest as Castiel and Ash pushed her to the absolute hilt. Sam scrambled to find something, anything. "Nothing," he reported finally. "I've sent the Washington to have a look though. Better to be paranoid and in one piece than the alternative."

Dean leaned forward in his chair, as if he could urge the Impala to greater speeds just through his sheer force of will. Massive atmosphere venting. The last time they had heard that alert from a Starfleet ship, the poor Miranda-class vessel had been airless in eight minutes. No survivors.

Enterprise was not going to suffer the same fate if the Impala had anything to say about it.

Enterprise

Kirk was frantically trying to put his best girl back together. Ten decks were currently out of commission, sealed off completely. The bridge had been lost. Infirmary was full of serious injuries. Gain was missing. And worst of all, one great gaping rent in the hull had managed to edge its way into the main ventilation system and was steadily drawing air from all over the ship into hard vacuum. Scotty and Chekov were swearing in five different languages between them as they tried to unscramble the sealing system currently off line.

Uhura was down in engineering, which had been unofficially dubbed the new 'bridge.' A clever Starfleet officer could do just about anything from engineering and right now Uhura was frantically broadcasting to anyone and everyone who might be listening. "Captain, Impala's on the way!" she finally reported with the first thread of hope Kirk had heard since this SNAFU started.

He didn't have time to reply with more than a few words as a crew member jammed a vacuum suit helmet over his head. He was going out with the sealer 'bot in an attempt to plug that hole in the ventilation system. If he didn't, the Enterprise was going to become a no-atmosphere situation and he'd have to start ordering people into escape pods.

If the pods weren't already compromised. Sulu was checking out that possibility and Kirk really didn't want Sulu to confirm what Kirk already suspected. All Kirk could do was focus as he and the 'bot hurtled up the shaft towards the crack. Activating the magnetic repulsors, he braked to a halt beside the innocuous six by four inch hole that was killing his ship. The job was simple but torturously slow and hard work, fighting against the rush of vital, precious air escaping the ship. If Kirk screwed this up, he could be yanked away from his nice, life-saving magnetic boots and forced through that tiny crack and frankly, that scenario just wasn't on Kirk's top ten list of ways to go.

Carefully filling the hole with the foaming sealant, Kirk watched in satisfaction as the hole grew smaller and smaller, air screaming as it tried to cram itself through the sealant. When the hole plugged and air finally stopped escaping with an abrupt release, Kirk moved to the second phase, welding durasteel all around the area and creating a bulkhead that would hold for longer than the temporary foam.

As a release of tension and fear, he reapplied foam all around the bulkhead and reinforced any areas that might be vulnerable to further twisting or tearing metal. Letting out a long breath, Kirk used his magnetized gloves and boots to start clumping back down the shaft to where his crew was frantically trying to locate their missing prisoners and replenish the precious air lost.

"Report," Kirk barked as soon as his feet hit the engineering deck, ignoring his screaming ribs and bruises.

"Not good, capt'n. We lost 48% atmosphere and that's only after we sealed off the damaged decks and shifted air from unused areas of the ship."

Half of their air, gone in less than ten minutes. "Life pods?"

The comm crackled briefly before Sulu cursed breathlessly. "Completely disabled. Walker had all night to get it done sir," he finished apologetically.

Kirk closed his eyes briefly. "All right. Thanks, Sulu. Scotty, get him out of there and then vent the air from those compartments as well. Uhura, Impala ETA."

"Fourteen minutes, sir."

"Spock?" Kirk crossed his fingers in a childish wish.

"Nothing yet, captain."

"Sir!" Cupcake's voice was taut with tension. "We just found a dead security officer outside of a minor chemical lab."

Then there was an ominous hiss in the ventilation shaft.

Washington

"Impala says to check on the Los Angeles?" Gibbs asked with mild curiosity. The Washington was parked on the outer edges of Earth's solar system as an early warning but the Hokkaido was sitting out with them. It would be the matter of forty minutes at maximum warp to do as the Impala requested.

"Apparently there's been a massive act of sabotage on the Enterprise and Impala is worried about the Los Angeles. No one can get in contact with her," Ziva reported with cool professionalism.

Gibbs frowned. "Dinozzo, max warp. Can't hurt to take a look."

"And if nothing's wrong, Winchester can treat us to a night out on the town!" his 2IC replied with good humour as he pushed the ship to top speed. McGee elbowed him sharply as he set in course.

"This is the Enterprise we're talking about," he reminded Dinozzo. "You can bet it's already gone to worst-case scenario."

Dinozzo shrugged. "McGeek has a point, for once."

"I find that McGee often has a point. It is far more likely to be valid than anything you come up with, Tony," Ziva shot back.

Gibbs glared and everyone shut up, focusing on the task at hand.

Los Angeles

Callen managed to set his shuttle down in the LA's hangar bay with no trouble and now his team was busy sweeping main corridors. It was silent. Too silent.

A quick scan using a security terminal revealed that there were at least 400 people in the hold and the ship was still venting atmosphere. The comm suddenly crackled. "Captain Callen, I know you're on board. My name is Gordon Walker and I am the one holding your ship hostage. Come down to the hold unless you wish to kill everyone, yourself included. I have a rather large bomb in my hand and absolutely nothing to lose anymore. Commander Hanna, would you care to confirm my intentions?"

"Not really," Callen's first officer drawled, but the captain could hear the resignation in the big man's voice. Walker was deadly serious and he had Sam over a barrel. The situation was deteriorating by the second.

"Well, captain? Do you want to hear my demands?"

Callen glanced around the hallway intersection he was currently standing at, brain racing at a thousand parsecs a minute. "Sure. I'll listen as I walk, shall I?" Come on Walker, Callen silently begged. Kirk had told the LA captain that Walker had a runaway mouth and an ego to match.

Sure enough, Walker began to extol at length about how clever he was and how it was useless for Callen to resist and soon everyone would see things his way. And the man ever so helpfully let it slip that he had captured all of Callen's bridge crew, listing each member with manic relish, up to and including his science officer Nell Jones.

One of the new security officers opened his mouth to exclaim at that revelation but Callen shot him a glare fit to kill, one that practically screamed shut up. They didn't know if Walker was watching or listening. And if Hetty was on the loose, when she decided to make her move, things would start to happen quickly. Until then, the most they could do was keep their mouths shut and let her work.

The surprised security officer found himself jabbed by his equals' elbows and glared at by his superiors before he was absorbed into the heart of the group where he could be watched carefully. Callen felt the soft draw of breeze that told him the ship was losing atmosphere at an alarming rate. "Look Walker, if you want this to succeed, someone has to seal the gaping crack up on the rec decks. Either let me seal off the decks or do it yourself, but it has to be done or we'll all be dead in less than ten minutes."

There was a pause. "You do that and only that. You have exactly sixty seconds."

Callen raised his eyebrows in surprise. Clearly Walker was either stupid or sleep-deprived. Perhaps dehydrated or starving. In Walker's position, Callen would never have given a ship's captain access to vital systems like that. But then again, Walker had been on the run from the Enterprise security teams for the past forty eighth hours and the Enterprise ran a tight security crew. After that, he would have been chased by LA security and Callen knew Sam could match Enterprise's famed Cupcake in efficiency and skill. Stopping off at engineering, Callen rattled through the passcodes necessary and slammed down the doors that would seal off the affected decks. Atmosphere reading at 70%. Shit. That gave them about four hours of air, assuming the hydroponics could handle the increased carbon cycling speed. At least the life pods were still operational. A quick peek at the cameras showed Gordon Walker standing in a sea of seated LA personnel, bridge crew in the front.

And Gordon Walker was wired up to a bomb that was big enough to blow a huge chasm in the hold. Everyone would be dead instantly. On top of that, the bomb was actually wired to Walker himself, surgically attached to his chest. Too high or too low of a pulse and the bomb would detonate.

Perfect. A suicide bomber. Callen thought about asking himself if the day could possibly get any worse but remembered Kirk's reaction to Callen's earlier statement about everything being under control.

The LA captain decided not to tempt fate.