A black SUV pulled up outside of a tall, glass skyscraper. A handsome man wearing a blue trench coat and suspenders marched out of the drivers seat door. A darker skinned woman hopped out of shotgun, and another man came out of the back. The woman held a large gun unlike any model seen on Earth, the blue trench coat clearly hid other things inside, and the other man held a crude metal stick with an unlit blue light at the end. He held it gingerly, as if it might explode.
"Okay, perception filter cuffs on." Said the man in the trench coat. The other two clipped large cuffs onto their wrists.
"You have the hand, right, Jack?" The woman asked.
"Oh right!" The man in the coat grinned, "kinda need that. Thanks Martha. Okay, Mickey Mouse, our sonic screwdriver's up and working, right?" Jack reached into the backseat and pulled out what appeared to be a human hand floating, ghost like, in a tank.
"Never getting rid of that name, am I?" The other man said with a smile. He pressed a button on the stick. It let out a high pitched noise and the blue light lit up. He pointed it at the car door and it popped open.
"Yeah, sonic's working."
"Great," Jack said, "Now we're good to go."
"So-how exactly do we go about this?" Martha asked.
"We knock." Jack banged on the door loudly four times. They waited several minutes. Jack knocked again. No answer.
"Well, since they obviously don't know who we are and don't want to let us in, we'll have to do this the hard way." Jack sighed.
"Mickey, get the harpoon and grab Martha, we're going to the top. Mickey put his arm around Martha's waist and shot a harpoon that had been in his jacket to the top of the building. Jack shot a withering look at the camera next to the door before doing the same. They shot up to the top, Jack's coat billowing in the wind.
Once they had all safely arrived at the top next to the decorative "A", Jack knocked on the glass and looked into the lab.
"Bulletproof," He said. "Well, good thing we have something for that." He glanced at Mickey.
"Right. I'm not actually entirely sure about the settings for glass-"
"Just do it, Mickey," Martha said quickly, "Before they notice."
Mickey pressed the button again and held it close to the glass. A crack appeared and then spread in a starburst till it covered the whole panel. Mickey bit his lip, his arm trembled slightly.
"Now see, this is the part I'm not sure-" Mickey was interrupted by the panel exploding, showering splinters of glass all around them.
"Okay well-" Jack spit glass out of his mouth, "-it worked."
"Yeah!" Mickey seemed to have discovered new found enthusiasm.
They stepped through the window onto the broken glass that crunched beneath their boots.
"We have a breach!" Steve shouted above the blare of the alarms.
"Where?" Natasha shouted back.
"Um, guys?" Bucky said nervously, "it's in the lab."
"The one day it's just the three of us!" Nat grumbled as they sprinted up the stairs.
"Tell me again why we didn't take the elevator?" Bucky growled.
"They could've blocked it already, or they could trap us in there." Steve answered, buckling his helmet.
They burst into the lab, ready to fight, and stopped. It wasn't burning, nothing seemed to be broken. No one was there. Except for one handsome man in a blue trench coat.
Jack looked at the three and assessed them. Not the girl, she looked too dangerous. Metal arm guy looked angry. Maybe Mr. Stars and Stripes?
"Interesting stuff you've got here." Jack said, picking up what looked like a vortex manipulator. The three tensed up. Nat trained her gun on him and Steve prepared to throw his shield. Interesting. What do I really have here? Jack thought. He blinked and kept his eyes closed for a fraction of a second longer. Remember what the Doctor always does. Jack told himself. Act cool and calm and unafraid. And smart. Always show off knowledge. Never fails. In the corner of his eye he saw Martha and Mickey. Martha gave him a reassuring nod and Mickey gave him a thumbs up.
"Vortex manipulator?" He asked.
"Don't play dumb." Metal Arm guy growled.
Jack started to put it on his wrist that didn't have his that didn't have his own vortex manipulator on it. He paused.
"Wait!" He laughed loudly, "Excuse my manners! Captain Jack Harkness, and who-" he pulled the rest of the cuff onto his wrist, but he didn't get any further because a round shield of vibranium hit him in the head. He fell to the floor with a thump. He dimly heard Martha gasp and he saw Mickey ready the sonic screwdriver. He looked up just in time to see the shield return to Captain America's hand.
"A fellow captain," Steve noted, "nice."
"Okay," Jack wiped a trickle of blood from his mouth as he got up. "Now I'm pissed. We come all the way from London, I'm being nice, and you hit me with a frisbee."
Nat snickered. Thank God, Jack thought in relief. At least someone's got a sense of humor.
"London?" Steve looked interested.
"Who's 'we'?" Bucky asked. Jack ignored him.
"Seriously," Jack said, "did we do something to-" he took a step towards Captain America, "-piss you off?" Jack drew a gun out from inside his coat.
"You think a gun scares me?" Captain America scoffed.
"Not this one," Jack put the gun back in his coat. "But you would be stupid not to be scared of that one." He pointed at Martha, who deactivated her perception filter.
"That gun would be incredibly useful for you," Jack said.
"It can blast through a Dalek's shield." Martha said.
"Wait, where did she come from?" Nat asked indignantly.
"What's a Dalek?" Steve asked.
Jack cleared his throat. "Perception filter. Unless you know it's there, which I did, you don't notice it. You see it, but your brain doesn't register it. You can hide in plain sight. Cool, right? Didn't see him either, did you?" Mickey appeared.
"What is that?" Bucky asked, pointing at the sonic screwdriver.
"A useful tool that broke your window." Mickey answered.
"Yeah, don't diss the sonic." Jack said. "So we came here because we-aghh, this is hard-need, um, your… anyone else wanna finish?"
"Help. We need your help." Martha finished.
"Exactly!" Jack exclaimed, "We, Torchwood and UNIT, need your help."
The three Avengers exchanged a look.
"Help with what exactly?" Steve asked.
Suddenly, an old memory surfaced from deep inside Jack. His eyes widened, and he stumbled backward a step.
Through the haze, he heard Martha ask, "Jack, are you alright?"
He shook his head.
"You two-" He waved at Steve and Bucky. Unfortunately, what Jack had picked up from the table was not a vortex manipulator, it was one of Iron Man's gloves. So when he waved, it shot at Bucky. It harmlessly glanced off his metal arm, but it startled everyone, including Nat. She pulled the trigger and sent a bullet straight into Jack's forehead.