They've added more articulation to the Gelfling's faces so they can better emote than they could in the movie. They've also used the green screen process to remove the puppeteers so the Gelflings can move more freely. Mark Hammill , Harvey Firestein, and Simon Peg all voice Skeksis. They even have some of the cast members of Game of Thrones doing voices. The plot's more intricate and character-driven than that of the movie, but everything is leading up to the film's events.