This cast is shaping up to be truly epic. Joining Taylor Kitsch, Lynn Collins, Dominic West, Polly Walker, Samantha Morton and Willem Dafoe are James Purefoy(Solomon Kane) as Kantos Kan, Captain of the ship Xavarian, Mark Strong(Sherlock Holmes) as Matai Shang, ruler of the godlike Therns and the already rumored Thomas Haden Church(Spider man 3) as Tal Hajus, a vicious Thark warrior.
Yeah I know, a lot of funny alien names and no descriptions. Well, the lovely folk at Empire have kindly color coded the Martians for us..
"that means that Church's character belongs to the savage race of Green martians, so we're guessing he'll be largely unrecognisable, being 10-12' tall, green, four-armed and with eyes on the sides of his head. Purefoy's character is one of the Red martians, so basically humanoid, while Strong's character is one of the white-skinned Thern, who are bald but wear wigs"
Lets hope this turns out to be as impressive as its cast.