At Cannes, the guys party it up and attend to the business of selling "Medellin," a not-so-easy task, since the finished film has yet to be screened. Meanwhile, Drama (Kevin Dillon) benefits from the overseas popularity of "Viking Quest." Written by Doug Ellin; directed by Mark Mylod.Ari, Vince, Billy, Drama and Lloyd will all be back next June for season five. (Though Rhys Coiro, who plays obnoxious indie director Billy Walsh, will first join the seventh-season cast of “24.”) 10 p.m. Sunday. HBO.