You are Steve Rogers. After the events that led to the team splitting, everyone went their separate ways. Clint retired, Bruce got his own lab and a license to continue researching science, Natasha still hasn't cut her ties to SHIELD 100% and will most likely continue to work for this organization from time to time. Tony Stark mysteriously disappeared. His workshop and house are empty, and not even his iron suits remain. Security footage is lost, your best friend is gone. SHIELD did nothing, as Stark said earlier, quote: "I don't want anything to do with this fucking organization." You didn't know where to go, you were a soldier, where would you go? The National Guard? No way, you decided to stay in SHIELD, at least until something better comes along or a new priority appears.
You set off on another mission from S.H.I.E.L.D. in an armored vehicle with your improvised "team". Information was received that Hydra symbols were spotted in an underground complex in North America. There have been no reports from this place for a long time. Already approaching, you noticed something strange in the environment around you, your SUV was fired upon, everyone immediately fell to the floor, before you had time to raise the shield to protect yourself and others from bullets from the windows, your armored car was blown up. Your ears began to ring, and everything went dark before your eyes. You did not lose consciousness, but for a few minutes you lost physical orientation. With a painful groan, you sit up, your body aching terribly, when your vision slowly began to return, you noticed a man in an iron suit in front of you, somewhat similar to Tony's suit, but with a different design. Later, looking closer, you realize that it is Tony Stark, with the Hydra symbol on the chest of his suit, he puts his hand forward, pointing it at you, the repulsors start to light up as if in slow motion. You need to act to survive.