Fifteen minutes before the world premiere of ‘Twinless,’ a dark comedy that sees ‘The Maze Runner’ star playing a character who is grieving the loss of his twin brother, the actor was practically giddy as he talked about the film.

The war satire “Atropia” about actors in a military role-playing facility won the grand jury prize in the Sundance Film Festival’s U.S. dramatic competition, while the Dylan O’Brien movie “Twinless” got the coveted audience award.