John Carter is just coming to grips with the loss of his princess, Dejah Thoris, when he catches wind of a diabolical plan - Matai Shang, Father of the Therns, knows how to free Dejah from her prison. But Shang is Carter's greatest enemy, and he's not about to hand her over! Mars's greatest hero is in for the wildest ride of his career, and it all starts in Warlord of Mars #21 - The Temple of the Sun!