Lotor has broken out of prison and taken over the throne of Planet Doom, as his father battles Voltron personally in the skies above! Sven and Romelle lead a team of commandos to blow up the Robeast laboratory. But Zarkon destroys the Blazing Sword, and Lotor surrounds Voltron with flying explosives, making it impossible for the team to move. The only one who can save them now is... Witch Haggar?