Bucky is an Avenger now, after Steve saved him from hydra. Steve and Bucky used to have an amazing best friend, Jax who is always Buckys wife. They are all from 1940 , but Steve and Bucky are the good guys while Jax is the bad.

Tony and fury were going after Bucky, Steve and a few others start on Bucky's side while the rest stay on Tony's. Shockingly Bucky and Steve got help, Jax came with her black magic

Jax: Walking to the lot, where Tony and his team go to fight Bucky and Steve's team