ThunderCats S01E61 - Lion-O's Anointment Final Day: The Trial of Evil

Finally, to prove that Lion-O is worthy to be the Lord of theThundercats, he must defeat his worst enemy. Mumm-Ra. He manages to find a way into Mumm-Ra's tomb, and defeats him by throwing his coffin into the evil cauldrum. This is the first time that Lion-O really defeats Mumm-Ra.

It's the moment of truth when Lion-O finally faces Mumm-Ra. Then Lion-O has to fights demons and other monsters then finally gets to Mumm-Ra. Lion-O for once not use his Sword of Omens and Power Claw, instead he used his fists, feet, and wits to win. In the end, Lion-O's hard work paid off and he has proven that he is not just Lion-O but that he is Lord of the Thundercats.