What would you do to save the one you love? To save your best friend? To save your comrade whom you have battled against the heavens with? Nothing they try seems to help their ailing comrade, and friend. How are they going to save him? How will they discover and then cure this illness? Will our heroes once again save the day? Read more to find out. Set after Iron Man 3 and before Avengers Age of Ultron.

BANG! The sound of metal on concrete wall was loud to anyone with natural hearing. With his ears still ringing, Iron Man stood up from where he fell to the floor from Hulk's throw. He took a minute to catch his breath. He looked up and saw Hulk give Cap a high five. He looked to his left and saw Rhody make a mark under the words 'Team Cap'; making the score 5-4.

"Hey! Ah. I thought this was supposed to be a new training exercise, not a competition?" He grunted.

"It was your idea, Tony." Rhody explained.

"When did I pitch that?" Tony asked, waving his iron arm in a questioning manner.

"Uh Jarvis?" Clint asked the open air.

"Colonel Rhodes is correct, sir. You asked for someone to keep score."

"I don't recall ever saying that."

"Would you like me to replay the recording, sir?" Jarvis asked. Even a A.I could sound a little sarcastic at this point.

"Uh, no thanks, Jarvis. Way to take my side, buddy." Without realizing it, that was meant for both Jarvis and Rhody.

"Ok boys, if you can't play nicely I'll have to ground you all."

"Hahaha." Clint chimed in.

"Damn." Steve said amused.

"Oh, Steve said a bad word." Tony remarked. The others laughed until a car was thrown at Tony and he went flying towards the wall again. The Hulk looked at him and laughed. The others continued to laugh as well.

"Hey, our take out is here, time to eat." Natasha called out.

"Yes, sustenance!" Thor bellowed. He used Mjolnir to fly up to the balcony to be the first to the food. Then the hulk tried to go but Natasha walked in front of him and caught his attention.

"Hang on big guy, suns gettin' real low." She started to calm Bruce down. It didn't take long, and soon they were on their way out of the arena.

"Not really that hungry." Tony said. Steve looked at Tony.

"One more round?" Pepper looked at Tony as if to say 'come on Tony that's enough'. But, when does he really ever listen to Pepper?

"You're on." He said. His face plate closed, the suit lit up and he stood battle ready. Cap got ready, putting his shield up. The others stood on the balcony to watch. The two leaders started running towards each other. It would take a few seconds since they were on opposite sides of the arena and the arena was fairly large.

As they were running, all of sudden, Tony noticed the room starting to spin. He became nauseous, and dizzy. He started breathing heavily. He started to feel exhaustion, sluggishness, and ringing in his ears all at once. He was trying to keep himself in flight but failed. He was going to call out to Cap to tell him to wait, that something was wrong, but it was too late. Cap's shield and fist came crashing down on Tony as he looked up. Tony was pushed back with so much force and strength he flew back and hit the same wall again. This time he slumped against it and didn't move.

Cap landed on the ground smiling. He beat Iron Man, the great Tony Stark. Of course it was just a bit of fun. He looked up and saw that Tony wasn't moving. But that wasn't what scared him and the others. The light on his arc reactor was off.

"Tony?" Steve called, while slowly moving towards him. No movement. Pepper was already halfway down the stairs. She was glad she was wearing jeans, tennis shoes, and one of Tony's T-Shirts. After Tony still didn't respond to their calls Steve and Pepper ran towards Tony, the others a few steps behind.

"Tony!" Pepper called. Once they reached Tony, Steve tried to get the face plate off with no success. Then he remembered that Jarvis could get it off.

"Jarvis. Can you open the suit? Get Tony out?" He asked worriedly.

"I'm sorry, sir. The Iron Man suit is offline. I cannot open it."

"Is there a manual override?" He asked again.

"Yes, sir. Just behind the neck, near the left shoulder." Jarvis answered. Steve proceeded to get the suit open. He and the others got Tony out and onto the floor. Pepper put Tony's head in her lap. He was unconscious. His breathing was ragged, his skin pale.

"Tony! Tony, can you hear me? Tony!"

"Stark!"

"Tony say something! Come on open your eyes!" 'Pepper? That's Peppers voice. Man, I'm so tired, I just want to go back to sleep.' He felt very stiff, he was on top of something very hard and cold. It definitely wasn't his bed. 'Why aren't I in my bed? Wait! When did I go to bed? Weren't we about to go eat dinner? Hold on a second, did I just get beat by a grown man wearing star spangled spandex?!.'

"Tony!" 'There's Pepper again. She sounds so close, why can't I reach her? '

"Tony open your eyes!" 'Wait, that was Steve this time. Wait, open your eyes? My eyes are closed? What is going on?' Tony's head started to shift a little. His eyes opened just a centimeter, he could make out a few silhouettes, but he didn't know who he was looking at or why he was looking up at them. He felt exhaustion hit harder than Thor's hammer. He attempted to resist the pull of sleep, but failed. His eyes closed and the last thing he heard, were his friends calling out his name.

Hey guys, so I got a little inspiration from watching Endgame, he doesn't get sick like he did in the movie, but you will find out in the next chapter or two. I don't know which. Chapter 2 will come as soon as I can get it done, this is my first real Avengers fanfic. Hope you enjoy, and as always if you think there is something I could have done better let me know, I welcome it. I want to make my stories really great! Thanks for reading!