ThunderCats wiki

Lion-O is the lead protagonist of the 2020 animated series, ThunderCats Roar.


Like the rest of the group of ThunderCats, he is from the planet Thundera which blew up. He along with his fellow kind crash landed on Third Earth.


He is a great deal rambunctious and inexperienced, and is prone to tackling problems without a proper plan as well as not taking things seriously, and having a poor sense of assessment.

Physical Description

Powers and Abilities

He can wield the Sword of Omens with some success, despite not actually knowing how to harness its powers. He can summon it, as he does in the episode Lion-S.


He has appeared in every episode of the series.


  • His voice is Max Mittelman, the same as WilyKat.
  • The only power he has is summoning his sword, his sword has all the power.