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Mothma is a neccisity to the prequels. In Ep2 I'd like to see her campaining in the senate against both Palpatine and cloning. I'd like to see her garnering support against Palpatine's stricter rules and dictatorshop like decisions, verbal fights in the senate would be cool. She can be shown as being a friend to Dodanna, Ob1, Bail and hopefully Garm Bel Iblis. In Ep3 she should have a much larger role. MM fights against slavery and the treatment of the Jedi. She's pinned as a traitor, discharged from the senate and watches as her accomplices are assasinated by Palpatine. She has to escape assasination herself and eventually only her, Bail and Iblis are left to start the rebel alliance. I still think Lucas shouldn't fill all the roles like hers with Aussies. He has enough cash to bring in an established american actress. I'd like to see McCormick, using the 50 something actor who played her in Jedi is not a good idea.
Re: grammar
I agree that we do have to see her in the prequels...she's a very important factor in the Rebellion so it would seem silly not to include her. I don't have a clue who would play her though. I do think it's going to be an Aussie actress just because we haven't heard one little leak that has anything to do with her character (If she's in 2 at all). Mon's kind of hard to pin because she came across as a very soft spoken, sweet, not what you would think of as a leader of a Rebellion. It will be interesting to see if they keep that sort of soft quality about her or if they depict her with a little more fire...Either way it could make for a strange chemistry if she has any scenes (which I would think she would) with Palpatine...