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On Lion-O's 20th birthday, he must pass a set of trials to become the true Lord of the ThunderCats. Even though he is the hereditary Lord of the ThunderCats, he must prove himself to be worthy of that title. His first test is to beat Panthro in a duel to test his strength.
First Air Date : Jan 23, 1985
Last Air date : Sep 29, 1989
Episode : 130 Episode
Season : 4 Season
Runtime: 22:14 minutes
Studio: Syndication
Country: United States of America, Japan