He-Man and the Masters of the Universe - Season 1 - Eps 63: The Once and Future Duke
While enjoying a lazy break fishing, Adam and Cringer see a young boy about to be eaten by a man-eating plant, and come to the rescue as He-Man and Battle Cat. Afterwards, Adam and Teela recognise the boy as their childhood friend David of Athra – only whereas they've grown, David looks the same as he did then! The Sorceress tells Adam that David's evil uncle, magician Count Marzo, cast a spell to transform him back to a child and wipe his memory. The only hope of restoring David to his proper self is to find the Ring of Remembrance, which is located in the Lake of the Lost. But, while He-Man, Teela and Battle Cat search for it, Count Marzo soon captures David back, and intends to use his magic powers to ensure He-Man and co. can never stop him...
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 367 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)