"Where is it "explained" in the movie that Sifo is Palps? " He's not. Sifo-Dyas was just another Jedi we never met, though he was responsible for the ordering of the Kamino Clones. His story is sort of explained in Labrynth of Evil. He was basically duped by Dooku and Sidious and eventually outlived his usefulness. But his end proved Dooku worthy as the Sith apprentice.