While on a super important mission to get batteries for the TV remote Lion-O meets Hachiman, a cool Samurai warrior. Now Lion-O will do anything to prove he's just as cool as Hachiman, even if it means risking his own life!

The Berbils build a giant, building-sized, Berbil named Berbcules to take back everything the Berbils ever built for the Mutants and everything they ever built for the ThunderCats!