Sebastian Stan had a part in an American miniseries.
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 . His role in Political Animals earned him a nomination for the Critics ' Choice Television Award for Best Supporting Actor in a Movie/Miniseries . Show Me a Hero is a 2015 American miniseries based on the 1999 nonfiction book of the same name by former New York Times writer , Lisa Belkin As in the book , the miniseries details a white middle-class neighborhood 's resistance to a federally mandated scattered-site public housing development in Yonkers , New York , and how these tensions affected the city as a whole .