Ep 31. The Sincerest Form of Flattery

Unable to contain his ambition, Lotor challenges Zarkon to a duel in the arena. The winner takes the throne of Planet Doom. Witch Haggar takes this opportunity to steal the spotlight and field her anti-Volron robot, programmed to discover and exploit Voltron's weaknesses. Concentrating all its fire on the Blue Lion, the robot successfully hands Voltron his first defeat!