ThunderCats (1985)

S1E37 Lion-O's Anointment First Day: Trial of Strength

As Lion-O celebrates his 20th birthday, he faces a series of challenges to earn his rightful title as the Lord of the ThunderCats. Despite being the chosen heir, he needs to demonstrate his worthiness for the role. His initial trial involves engaging in a duel with Panthro, designed to assess his physical strength and combat skills.