
In an effort to prove them worthy of being Thundercats, the Thunderkittens borrow the other Thundercats' weapons and practice with them. The Mutants, who gain possession of the weapons, ambush them. The Thunderkittens keep the theft a secret from Lion-O and go to Castle Plun-Darr to get the weapons back. They surprise Monkian as he vainly poses in front of a mirror with Panthro's nun-chuks. The Mutants attack and the Thunderkittens escape back to the Lair using their magic pellets. The Thunderkittens return later with Lion-O to engage the Mutants. Lion-O calls the other Thundercats using the Sword -- then a Mutant Heat Ball causes him to drop it. The Thunderkittens are able to subdue the Mutants first with a magic pellet, which causes a tidal wave, then with another, which engulfs the Mutants in laughing gas. The Thundercats reclaim their weapons.
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