Kristen Bell has signed on to give her voice to the new CG-animated movie, Astro Boy.

The Forgetting Sarah Marshall actress joins a cast of Nicolas Cage, Scarlett Johansson, Donald Sutherland, Bill Nighy, Nathan Lane, Eugene Levy and Freddie Highmore .

Astro Boy is about a powerful robot boy created by a brilliant scientist in the image of the son he has lost. Our hero journeys to find acceptance in the human world, and ultimately discovers true friendship as he uses his incredible powers to help others and save Metro City from destruction.

The movie is set for a 2009 release date.

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