She-Ra: Princess of Power (1985)

S2E5 Something Old, Something New

Ely, the sorcerer's apprentice, seizes the Serenity Stone from the clutches of Shadow Weaver's minions, gaining immense power and an inflated ego. However, he fails to recognize that removing the stone from its rightful location will throw Etheria into chaos. As Ely revels in his newfound abilities, the consequences of his actions begin to loom, threatening the very balance of the realm he seeks to dominate.