3x20 - Voltron: Defender of the Universe

After recharging the Lions back on Arus, the Voltron Force heads back to Planet Doom to challenge Zarkon. Merla convinces Lotor to try being good. Merla and Lotor decide to help the Voltron Force. Zarkon's robot troops bring a group of slaves, and threaten to hurt them unless Voltron surrenders. Lotor sees through the deception, and hurls his sword at one of the slaves. The slaves are revealed to be more robot troops in disguise. Lotor leads the Voltron Force to Castle Doom, where they confront Zarkon in the throne room. The Voltron Force is caught in a trap with a Tentacle Bomb. Now they must escape before the entire planet blows sky high.