Lion-O is a fictional superhero and the main protagonist character of the ThunderCats franchise. Lion-O is the leader and the hereditary "Lord of the ThunderCats." Lion-O is based on the lion and wields the legendary Sword of Omens, which is able to fire bolts of energy and allows Lion-O to see across great distances with its power of "Sight Beyond Sight", as well as the Claw Shield, a gauntlet that launches grappling lines from its claws.