He-Man and the Masters of the Universe - Season 1 - Eps 11: Turnabout
In an effort to prevent Skeletor's evil, Man-At-Arms invents a groundbreaking crystal belt that weakens the villain every time he performs an evil act, or even thinks about doing so. Skeletor is horrified to learn that he can never be evil again, but his Evil Warriors have other ideas. As the heroes believe more peaceful times are upon them Tri-Klops presents to Skeletor a harness, one that will turn He-Man's goodness against him!
About He-Man and the Masters of the Universe

Title: He-Man and the Masters of the Universe
First Air Date: 2002-08-16
Last Air Date: 2004-01-10
Status: Ended
Rating: 7.4/10 (from 53 votes)
Language: EN
Seasons: 2
Total Episodes: 39
Network: Cartoon Network
Genres: Action & Adventure, Animation, Sci-Fi & Fantasy, Kids
Production Companies: Unknown
Synopsis
Years ago, two leaders battled for the fantastical land of Eternia, one became the good King Randor, the other grew into the evil monster Skeletor who plans to rise once again and take Eternia. To protect the kingdom, the mystical powers of Castle Greyskull chose a hero - Randor's lazy, impulsive teenage son Adam.
Cast

Cam Clarke
He-Man (voice)

Lisa Ann Beley
Teela (voice)

Garry Chalk
Man-at-Arms (voice)

Brian Dobson
Skeletor (voice)

Kathleen Barr
Evil-Lyn (voice)

Gabe Khouth
Orko (voice)

Nicole Oliver
Sorceress (voice)

Michael Donovan
King Randor (voice)

Christopher Judge

Don Brown