The Avengers were raiding a HYDRA base that had been experimenting on people, more specifically kids. As they searched through the base, only you had survived.

Natasha had found you in a cell, bloody and bruised, no older than 16 years old and covered in cuts. You had a number tattooed on your neck, 345, your soldier number.

“Hey kiddo, are you alright?”

Natasha’s voice was soothing, Tony, Bucky and Clint standing behind her. The rest of the Avengers fighting off HYDRA agents.