Fall of Grayskull is a live action fan short film about He-Man and Skeletor, along with various heroes and villains from Planet Eternia, battling over the secrets and powers of the mysterious Castle Grayskull. This film was funded through Kickstarter and directed by MOTU Super-fan and Castle Grayskull-Man creator Daniel Benedict.

The FoG team have just released a new trailer for the upcoming fan film:

In addition to the trailer they are offering a new free downloadable comic to coincide with the film.  It serves as a prologue and tells the story leading up to the movie.
It’s available for free on their website: http://www.fallofgrayskull.com/