ThunderCats wiki

Return of the Thundercubs is the one hundred second episode of ThunderCats (original series).


Panthro, Tygra, and Cheetara return to New Thundera in the Feliner to find more of the Treasure of Thundera, but Mumm-Ra shoots the Feliner down and, as the Fog of Despair, sends them to the Canyon of Youth, which changes them back into Thundercubs. Then Mumm-Ra disguises himself as Lion-O and tells the Thundercubs to find the treasure for him.

Meanwhile, back on Third Earth, Lion-O and Snarf decide to go rescue the ThunderCats on New Thundera, but they must ask the Mutants to take them to New Thundera in the Ratstar. The Mutants agree, secretly planning to attack Lion-O once they're in space. They do attack and imprison him and Snarf on the way to Thundera, but they manage to break out.

Cheetara meanwhile, using her sixth sense, locates part of the treasure, the Mirror of Truth. The real Lion-O shows up, and uses the Sword of Omens with the Mirror of Truth to restore the cubs to their proper age, and Mumm-Ra reveals himself and turns into Mumm-Ra the everliving. Cheetara uses the mirror to defeat Mumm-Ra. Finally, the ThunderCats use the Rat-Star's supplies to fix the Feliner, and then go home with the Mutants wedged in the baggage compartment.






  • After the destruction of his Black Pyramid for New Thundera, Mumm-Ra decides to build a makeshift location for his cauldron in a cave near where the previous Black Pyramid was location. His grotto would serve him til the end of season three for New Thundera.