I got this off of imdb.


Cast overview, first billed only:
Ewan McGregor .... Obi-Wan/Ben Kenobi
Hayden Christensen .... Anakin Skywalker/Lord Darth Vader
Natalie Portman .... Senator Amidala/Padmé Naberrie-Skywalker
Ian McDiarmid .... Supreme Chancellor/Emperor Palpatine/Darth Sidious
Samuel L. Jackson .... Mace Windu
Christopher Lee .... Count Dooku/Darth Tyranus
Anthony Daniels .... C-3PO
Kenny Baker .... R2-D2
Peter Mayhew .... Chewbacca
Frank Oz .... Yoda (voice)
Jimmy Smits .... Bail Organa
Genevieve O'Reilly .... Senator Mon Mothma
Ahmed Best .... Jar Jar Binks
Jay Laga'aia .... Captain Typho
Joel Edgerton .... Owen Lars