PSYKHE: Winter Soldier

Atlas Walker was a skilled level 7 SHIELD agent and was one of the organization's best combatants. He loved his life in the agency. He spent a good 4 years being a SHIELD agent and wouldn't have changed a thing. That was until a mysterious alliance got a hold of him on one of his missions and kept him in a remote facility to do their twisted experiments.

SHIELD was able to find and save him after many months when they discovered an unknown facility. They tried to find out more about it, but it was blown to bits before any further digging could be done. Atlas resigned from SHIELD right after. But a year later, Fury asks for his help to defeat an unknown force that lurks beneath SHIELD after he's been attacked by a couple of officers and the Winter Soldier. Will you follow Atlas Walker in his story of becoming an Avenger?

Disclaimer:
I do not take ownership of any of the characters in this story except for my own. Marvel Studios and Marvel comics own the rest of them.