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The official STAR WARS website has announced that actress Genevieve O'Reilly will play the character of Mon Mothma. Originally introduced to audiences in RETURN OF THE JEDI and played by Caroline Blakiston, she presented the briefing about the Empire's second Death Star and is the defacto leader of the Rebel Alliance. It's very likely the character will be introduced as a Senator in EPISODE III.

O'Reilly has had roles in BEASTMASTER and the sci-fi action flick AVATAR as well as an upcoming part in THE MATRIX REVOLUTIONS.
From Cinescape