Although there hasn't been any official announcement on whether Bucky Barnes/Winter Soldier will ever get his own solo film, Avengers: Endgame star Sebastian Stan knows what he'd like to see in a prequel movie.
"I think my favorite is all the Ed Brubaker stuff," Stan said at Jus In Bello in Italy. "That was my favorite stuff, and it was just really great to get to do some of that in the movies, and you know, I would love... I always say this all the time but I think it would be really interesting to see like the whole Winter Soldier that we haven't seen yet. If you think about it, he had a whole other life sort of as this ulterior ego so to speak. Like when you see the Winter Soldier now he's sort of like a machine in the movies, but before that, there was actually a real character there, and that was the character that had friendship with Black Widow. But you know, we'll see what happens."
There are currently plans for a Disney+ series called The Falcon and The Winter Soldier, which focuses on Sam Wilson/Falcon and Bucky. It's not totally clear at this time when that series is set.
Directed by Joe and Anthony Russo, Avengers: Endgame stars Robert Downey Jr. as Iron Man, Chris Evans as Captain America, Mark Ruffalo as Bruce Banner, Chris Hemsworth as Thor, Scarlett Johansson as Black Widow, Jeremy Renner as Hawkeye, Brie Larson as Captain Marvel, Paul Rudd as Ant-Man, Don Cheadle as War Machine, Karen Gillan as Nebula, Danai Gurira as Okoye and Bradley Cooper as Rocket, with Gwyneth Paltrow Pepper Potts, Jon Favreau as Happy Hogan, Benedict Wong as Wong, Tessa Thompson as Valkyrie and Josh Brolin as Thanos. The film is in theaters now.