QuiGon in Ep3!
http://www.usatoday.com/life/movies/news/2005-04-27-liam-neeson_x.htm
Although his stately Jedi master Qui-Gon Jinn was a goner in Star Wars, Episode I: The Phantom Menace, Neeson puts in a ghostly appearance in the series finale, Star Wars, Episode III: Revenge of the Sith on May 19.
In Phantom Menace, he mentored Ewan McGregor's Obi-Wan Kenobi and trained Jake Lloyd's Anakin Skywalker as a junior Jedi before meeting his fate in a saber duel opposite the vicious Darth Maul.
But much like Alec Guinness' Obi-Wan in the first trilogy, Qui-Gon's influential spirit lingers on.