ThunderCats (1985)

S1E16 The Fireballs of Plun-Darr

Title: The Fireballs of Plun-Darr Plot: The Mutants are on the hunt once more for a means to vanquish the Thundercats. They salvage parts from their spacecraft, transforming the engine into a massive machine that unleashes fiery projectiles. As the Mutants wreak havoc across Third Earth, the Thundercats devise a plan to confront them. They make their way to Castle Plun-Darr, where they successfully dismantle the threat posed by this formidable new weapon.