He-Man and the Masters of the Universe - Season 2 - Eps 21: Into the Abyss
Prince Adam finds his work as He-Man is tiring him out, and Teela is getting frustrated with Adam's apparent laziness, unaware of the real reason for it. After a heated argument between the two of them, Teela decides to make up for it by making Adam train in a fun way, by following her across an obstacle course with a tracking device. Teela runs way ahead of Adam, but runs headfirst into danger as she slips over the edge of Castle Grayskull's abyss and falls down into its bottomless depths. When they realise the possibly fatal situation Teela is in, Adam (as He-Man), Man-At-Arms and The Sorceress must do their best to rescue her before it's too late.
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: 7.293/10 (from 374 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)