He-Man and the Masters of the Universe #6

Now reunited with their memories restored, the Masters plan on how to take Castle Grayskull back from Skeletor's forces. He-Man reveals that Skeletor was able to achieve victory only through Orko's treachery. Instead of working with the group, He-Man, Battle Cat, and Teela attack the castle at night. Skeletor is defeated, only to be transported to another dimension by a secretive figure acting through the red skull.