A crack team of pilots is selected by the Galaxy Alliance to travel to Planet Arus and uncover the secret of a weapon from ancient times, Voltron! Keith, Lance, Sven, Hunk and Pidge arrive too late, the planet has already been completely devastated by the evil forces of King Zarkon. They engage in battle with Zarkon's general, Yurak, only to be captured and thrown into the dungeons on Planet Doom.