In the story of a Civil War soldier transported to the red planet where warring races vie for control, Dafoe will play Tars Tarkas, a leader of the Thark race who knows that the only way his people can survive is if they turn away from war, a position that may cost him dearly.
Thomas Haden Church, who is also rumored to be appearing in the movie, was previously linked to the role. The movie will also star Taylor Kitsch as John Carter and Lynn Collins as Dejah Thoris, the heir to the throne of Mars' Helium kingdom whom he falls in love with.
It will be interesting to see how Dafoe will look come movie time as in the comic, Tarkas looks like this..
I'm sure his appearance will be altered slightly! Anyway, there's no doubt that Dafoe is a great addition to the cast as he excels in everything he appears in..even if the movies are not always that good!