More casting for JCoM

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Dark Horizons reports that Thomas Haden Church has been cast in John Carter of Mars but no word as to what role he will take. From Church's comments it sounds a bit like he's not too certain what it's all about.

ETA: Empire Online suggests the role could be Tars Tarkas - given his effort at Flint Marko, Church certainly has the physical presence to carry out such a role.