Original Episode: 9/26/1983
At Castle Grayskull, Evil-Lyn and Beast Man prepare to lower the jaw-bridge. When the Cosmic Comet flies above them, Evil-Lyn utilizes its power to bring the jaw-bridge down, only to find He-Man, Battle Cat, and Man-At-Arms inside. He-Man quickly defeats the two villains. The Sorceress warns the heroes that the attack was only a test of the Cosmic Comet's power. She directs He-Man to visit Zagraz, the keeper of the comets who lives on Zagraz Mountain. At the Royal Palace, King Randor gives Man-At-Arms, Prince Adam, Teela, and Orko permission to go on a "secret mission."
A short while later, Skeletor, Evil-Lyn, and Beast Man seize control of the Cosmic Comet, as the Heroic Warriors arrive at Zagraz Mountain. Zagraz the wizard is thrilled to have company. He explains that the Cosmic Comet was produced by his own foolishness, and relates how he once tried to control two happy comets that were wandering in space: Zagraz used too much power at the time and destroyed one of the comets. The incident left the Cosmic Comet lonely and evil and left Zagraz without confidence in himself.
Skeletor decides to attack Zagraz, and commands the Cosmic Comet to send three bolts to Zagraz Mountain. When the bolts hit the ground, they grow into comet creatures. Unable to control the creatures Zagraz collapses to the ground. Out of sight Adam transforms into He-Man and destroys the creatures. Orko vacuums the comet pieces up his sleeve. He-Man takes the collapsed Zagraz to Castle Grayskull, where the Sorceress believes she can revive him. He-Man and company ride the Attak Trak to Snake Mountain, but are quickly overpowered by the comet-charged Skeletor and Evil-Lyn. The Sorceress magically transports the defeated heroes back to the castle, before Skeletor can touch them. Skeletor declares that the Cosmic Comet will attack Castle Grayskull.
At the castle, Zagraz says that comet pieces could be used to make a new comet. Orko releases his collection of comet fragments, which the Sorceress fuses into a new comet. Teela, Man-At-Arms, Sorceress, and He-Man stand around the comet. Zagraz encourages them to fill it with love and goodness. When the Cosmic Comet charges at Grayskull, Zagraz does not release the good comet in time. He-Man leaps into the air and fights the Cosmic Comet until Zagraz is ready. The two comets collide and both become good.
Skeletor is disappointed when he discovers Castle Grayskull is still intact. The comets attack the villain, making him flee toward Snake Mountain. At the Royal Palace, Zagraz teaches Adam a comet-control technique by having him meditate floating globes. When Adam becomes distracted, one of the globes chases Orko.
Synopsis by Zadoc Angell