Labyrinth is a historical television miniseries based on the 2005 novel of the same name by Kate Mosse . Sebastian Stan ( born August 13 , 1982 ) is a Romanian-American actor , known for his role as Bucky Barnes / Winter Soldier in the Marvel Cinematic Universe . On television , Stan portrayed Carter Baizen in Gossip Girl , Prince Jack Benjamin in Kings , Jefferson in Once Upon a Time , and T.J. Hammond in the miniseries Political Animals .
Sebastian Stan had a role in a German miniseries.