He-Man and the Masters of the Universe - Season 1 - Eps 13: Night of the Shadow Beasts
Beast Man introduces Skeletor to the Shadowbeasts, large powerful creatures that attack at night in vast numbers. Knowing the creatures hate any light source, Skeletor and the Evil Warriors cause Mount Barathrum to explode sending out a large ominous could that blocks out the sun. Ram Man must face his fears after Teela is injured during the attack, as the heroes soon realize the Shadowbeasts are striking both the Royal Palace and Castle Grayskull!
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