He-Man and the Masters of the Universe - Season 1 - Eps 36: City Beneath the Sea
He-Man and Man-At-Arms set sail to investigate the disappearance of some of King Randor's food ships. Sucked beneath the surface by a whirlpool, they find themselves in the underwater city of Aquatica, which has been taken over by Merman. Merman has kidnapped the city's princess, Nahmi, and is controlling the Aquaticans with the Pearl of Power! But he has convinced them that the surface dwellers kidnapped Nahmi, and the Aquaticans have waged war against the people of the surface. Can He-Man help the Aquaticans see the light, and rescue Princess Nahmi before Merman creates more havoc?
About He-Man and the Masters of the Universe

Title: He-Man and the Masters of the Universe
First Air Date: 1983-09-05
Last Air Date: 1984-12-08
Status: Ended
Rating: 7.3/10 (from 369 votes)
Language: EN
Seasons: 3
Total Episodes: 130
Network: Syndication
Genres: Action & Adventure, Animation, Sci-Fi & Fantasy, Kids
Production Companies: Mattel, Filmation Associates
Synopsis
When Adam, Prince of the planet Eternia, raises his magic sword he transforms into He-Man (the most powerful man in the universe). With his allies and friends, he battles the evil Skeletor and his minions to protect the secrets of Castle Greyskull.
Cast

John Erwin
He-Man / Prince Adam / Ram Man / Beast Man / Whiplash / Webstor / Faker / Granamyr (voice)

Alan Oppenheimer
Skeletor / Battle Cat / Cringer / Man-at-Arms / Mer-Man / Buzz-Off (voice)

Linda Gary
Teela / Evil-Lyn / Queen Marlena / Sorceress of Castle Greyskull (voice)

Lou Scheimer
Orko / King Randor / Stratos / Mekaneck / Man-E-Faces (voice)

Erika Scheimer
Arcadian women (voice)