Samantha Morton, Dominic West pack for 'Mars'

The cast of Walt Disney's "John Carter of Mars" is growing, and Samantha Morton, Dominic West and Polly Walker are the latest to join the big-screen adaptation of Edgar Rice Burroughs' series of books.

Taylor Kitsch, Lynn Collins and Willem Dafoe are already part of the crew. The film focuses on a Civil War veteran (Kitsch) who is mysteriously transported to Mars, where he encounters a bunch of four-armed, green creatures.

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