Bucky has a wife and her name is Wolf, but what he dont know is she's Peirce's daughter. They met at Hydra, they are both experiments. Bucky has a metal arm from being 'winter soldier', Wolf has Purple eyes from being 'Siren soldier'.

Steve saved them both. Bucky and Wolf are Avengers, but Bucky finds out who her father is and has to see if she's still on the Avengers side.

The team, Tony, Wanda, Sam, Steve, Clint, Natasha and Peter are all behind Bucky a gun to Wolf's head.