ThunderCats
The ThunderCats are on the move! After the kingdom of Thundera is attacked by the lizard people, Lion-O leads Tygra, Cheetara and the other heroes on a quest for the Book of Omens and the magic stones of legend. But he'll have to face villains like Mumm-Ra, the ancient evil sorceror, and Slithe, the dangerous lizard general. Luckily, he has the Sword of Omens and its amazing powers at his disposal.

Season 1 · Episode 15 ·
The Trials of Lion-O (1)
During an ambush, Lion-O falls to his death, but he is given a second chance at life - if he can pass a series of trials that pit him against each of his teammates.
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Episode 15 of season 1 of ThunderCats: “The Trials of Lion-O (1)”. Aired 2012-03-31. Watch it online free on ZapFlix.