Getty Months after it was first rumored that Sebastian Stan would join the cast of The Batman: Part II, the actor is finally commenting on the project. After years of playing Bucky Barnes in the Marvel Cinematic Universe, Sebastian will be joining the DC Comics Universe. Sebastian told Deadline that the movie will be "a challenge, like everything else. I feel like it's a really ambitious movie and I think if we do it all right - and obviously I'm so excited about Matt Reeves [directing] because he's been one of my favorites for a long, long time - I really think it's going to blow people away.