Characters of Monsters vs Aliens
Among the characters of the upcoming Dreamworks 3D animated movie, there are:

– Ginormica / Susan Murphy is voiced by Reese Witherspoon;

– Dr. Cockroach Ph.D. voiced by Hugh Laurie;

– Bob voiced by Seth Rogen;

– General W.R. Monger voiced by Kiefer Sutherland;

– The Missing Link voiced by Will Arnett;

– and The President voiced by Stephen Colbert.

You may check the poster in a better resolution at:

Monsters vs Aliens Character Posters
I expect a lot from this movie by now: I’m confident that Dreamworks will produce an amazing sci-fi movie!
:)