Mumm-Ra Lives! Part I

Mumm-Ra is weak and he faces the threat of three new ThunderCats, so he sends the Mutants to release his old enemies the Lunatacs imprisoned in Dark Side in order to bolster the forces of evil. The ThunderCats celebration of their victory over Mumm-Ra and the welcoming of three new ThunderCats is cut short when Snarf overhears plans at Castle Plundarr after he chased Ma-Mutt there from the Berbil village.