The legendary ape-man starts having second thoughts about his newfound Martians 'pals', the devious Therns, who just so happen to be the bitter enemies of John Carter. But all that might not matter - Carter is paying the Therns a little visit, and he and the ape-man are on a collision course that will change the face of two planets forever. Jane, the ape-man's wife, goes looking for proof of the Therns' treachery, and she ends up finding more than she bargained for. The sky erupts with fire in Lords of Mars #4 - War in Heaven!