June 5 (UPI) -- Masters of the Universe , a new live-action film adaptation of the Mattel franchise, opens in theaters Friday. The movie is directed by Travis Knight ( Bumblebee ) and stars Nicholas Galitzine ( Red, White & Royal Blue ) as Adam Glenn, aka He-Man, a prince trying to defend Castle Grayskull and the planet of Eternia from the evil Skeletor (Jared Leto). Also starring Camila Mendes as Teela, Alison Brie as Evil-Lyn, Idris Elba as Duncan, Jóhannes Haukur Jóhannesson as Malcolm and