"Uncover the fabulous secret powers of Castle Grayskull in Season 1, Volume 2 (32 episodes) of He-Man and the Masters of the Universe!" -- iTunes Store
Download for Free!
In exchange for reversing a spell cast on Man At Arms, Granamyr, asks He-Man to bring him Skytree, the only thing on Eternia older than him.
the fine print: Downloads posted on the Free iTunes Downloads blog are usually free for ~1 week. After that, you'll have to pay for them.