ThunderCats
The inhabitants of the planet Thundera evacuate just before it is destroyed. They were pursued by a band of mutants. All but one of their escape ships was destroyed. Only a small group of Thunderians (Thundercats) remained. With only half engine power, the group, which was led by Jaga, had to set a course for the nearest planet. Jaga commanded their ship while the other seven were in their stasis tubes. Jaga died on their journey to Third Earth and their ship crashed there. Soon they made friends with various groups in the area and they designed a fortress. Mumm-Ra the centuries-old embodiment of evil, along with the mutants that destroyed the rest of the Thunderians are a constant threat. But Lion-O, the new leader of the Thundercats, with his weapon the "Sword of Omens" will help the Thundercats to have a standing chance.

Season 4 · Episode 8 ·
The Heritage
Wily Kit and Kat, exploring New Thundera, stumble upon an Orb of Gold, and pick it up thinking that it is apart of their Heritage. Possessed by the power of the Golden Sphere of City, the ThunderKittens get greedy, and let the power of the orb overcome them. Mumm-Ra manages to get a hold of the orb, and his powers get four times more powerful. He gets so powerful, he destroys the Sword of Omens. Jar, the scrap metal collector reforges it for Lion-O. He gets so powerful that he challenges the power of the ancient spirits of evil. They lock him out of his pyramid until he surrenders the Orb to them. The spirits of evil let him back in, but destroy the Golden Sphere of City.
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Episode 8 of season 4 of ThunderCats: “The Heritage”. Aired 1989-09-13. Watch it online free on ZapFlix.