Sebastian Stan is a Romanian-American actor best known for his role as Bucky Barnes, also known as the Winter Soldier, in the Marvel Cinematic Universe, appearing in films such as Captain America: The Winter Soldier (2014) and Avengers: Endgame (2019). Outside of Marvel, he has earned critical praise for performances in I, Tonya (2017), Pam & Tommy (2022), for which he received an Emmy nomination, and Fresh (2022). As a versatile actor, Stan has worked across film and television, taking on roles in action, drama, and psychological thrillers.