Sebastian Stan Thought His Bucky Barnes Casting Was an April Fool's Joke "I was on set working on something and then this unknown number called me." May 24, 2021 Marvel's Sebastian Stan has revealed the awkward way he learnt about being offered the role of Bucky Barnes. It's fair to suggest Stan was lesser known before his MCU explosion–stints in Gossip Girl, Once Upon a Time, and Hot Tub Time Machine paid the bills. So you'd imagine that Kevin Feige's call would be one he'll remember forever—if only he had picked up. In conversation with Variety, Stan lifted the lid on how he found out he got the role of Bucky through a voicemail from Marvel boss Kevin Feige. "It was April 1, April Fool's Day. I was on set working on something and then this unknown number called me, and I don't usually pick up unknown numbers," he began.