He-Man and the Masters of the Universe (1983)

S2E30 Trouble's Middle Name

The Sunstone, located in the Temple of the Sun, is losing its energy and needs to be recharged during the once-a-century Ceremony of the Sun. The guardians of the Sunstone invite He-Man and his friends to participate in the ceremony. However, their journey is threatened by Negator, who seeks the Sunstone’s power for his own gain. Complicating matters further, a mischievous Trollan named Prankster is causing chaos and insists he will only leave them alone if they can guess his name.