He-Man and the Masters of the UniverseS1 E1

After many years of peace on the planet Eternia, the Mystic Wall that has held evil back for so long begins to weaken. As the Royal Palace celebrates the sixteenth birthday of Prince Adam, Skeletor and his Evil Warriors finally succeed in destroying the Mystic Wall. Adam's mentor Man-At-Arms takes the teenage to the mysterious Castle Grayskull where a being known only as the Sorceress explains the history of evil on Eternia, and the very special destiny that awaits Adam...