He-Man and the Masters of the Universe

Skeletor tricks He-Man into thinking he has accidentally killed a man and, consumed by guilt, He-Man transforms back to Adam and drops his sword down the abyss of Grayskull, deciding he is no longer worthy of Grayskull's powers. Skeletor then opens a portal to the goblin world, enabling General Tataran's army to enter Eternia, with possibly enough power and strength to conquer the planet. Can Eternia survive without its greatest hero... and will Adam realize he has been tricked before it is too late?

Strange living plants are gradually taking over Eternia. He-Man accuses Skeletor, and Skeletor accuses He-Man, but the real culprit is a curious plant-man called Evilseed, who intends to take over the whole planet with his plants. He-Man and Skeletor must reluctantly combine their powers in order to wither Evilseed's plot...

After Queen Marlena, using Man-At-Arm's new 'mind projector', relives how she came to crash-land on Eternia years before, Teela tries to use the device to learn who her mother is, but is frustrated when it is unable to display the image. She decides to head to the Crysal Sea, in search of the legendary Oracle, the only thing on Eternia that could possibly tell her of her true parents. But Mer-Man, defeated years before by Man-At-Arms, is looking to get even, and plans to use Teela as a sacrifice to a sea God...