One minute, Civil War veteran John Carter (Taylor Kitsch) is evading Apaches in a deserted cave. The next, he's waking up on Mars, a once-Earthlike planet that's devolved into chaos -- and civil war of a different sort. Based on Edgar Rice Burroughs's classic "Barsoom Series," this sci-fi adventure finds Carter coming to the aid of Martian princess Dejah Thoris (Lynn Collins) and pitching in to help protect the planet.