Actor Sebastian Stan, who played Captain America’s sidekick Bucky in Captain America: The First Avenger, will return as Bucky in the sequel Captain America: The Winter Soldier, which the Russo brothers are directing, and which will be in theaters on April 4th, 2014.
 
Bucky was supposedly killed in the same explosion that imprisoned Cap in a block of ice, but Ed Brubaker resurrected Bucky for his Winter Soldier storyline.  In Brubaker’s saga, Bucky survived the explosion, which cost him his memory.  The Russians trained Bucky as an assassin and his path crosses with Cap’s again when Bucky, now known as the Winter Soldier, apparently kills the Red Skull.
 
Variety reports that Stan has signed a six-picture contract with Marvel Studios and that he will reprise his role as Bucky in the Captain America sequel, which could also see the return of Hugo Weaving as the Red Skull, though no announcement has been made yet.