John Carter of Mars is a fictional sci-fi kind of a movie. It revolves around the story of Civil war veteran and hero John Carter who is moved to Mars as part of an experimental program. John soon realizes that he is the only human being on the planet and that the rest has been taken over by 12 feet tall green giant barbarian creatures. John has to escape from these barbarians before he gets hurt. In his flight, he comes upon the Princess of Helium who is a damsel in distress and badly needs to be rescued.