Sebastian Stan is “Captain America” Sidekick Bucky Barnes

After playing a lothario on CW’s “Gossip Girl,” Sebastian Stan is moving on to become Captain America’s trusty sidekick Bucky Barnes in “The First Avenger: Captain America.” Marvel confirmed that Stan, who recently appeared in the John Cusack starrer “Hot Tub Time Machine,” will play the character Barnes. Sources with knowledge of the deal said Stan has signed up for five to six films, which could include “The Avengers.”

Stan was one of those who auditioned for the “Captain America” role that eventually went to Chris Evans. Stan’s character became the Winter Soldier in the comic version of “Captain America.” However, it is still not clear if the movie will feature Bucky Barnes as the assassin Winter Soldier.

The first of several “Captain America” films will begin shooting this summer in Europe, with Joe Johnston taking the helm. Stan has just finished working on the Joel Silver-produced thriller “The Apparition” and Darren Aronofsky’s “Black Swan.”