Watch ThunderCats Season 1 Episode 37 Online with Multi Subtitles - OnionPlay

Watch Watch ThunderCats Season 1 Episode 37 Online with Multi Subtitles - OnionPlay on OnionPlay - On Lion-O's birthday, when he turns 20, he must go through a series of trials to become the true Lord of the ThunderCats. Even though he is the hereditary Lord of the ThunderCats, he must prove his worth to deserve this title. His first trial is to face Panthro in a duel to test his strength.