This is the incredible true story of six men who embarked on a treacherous, 2,000-mile journey across the forbidding tundra of the Northwest Passage-an alien voyage on planet Earth designed to prepare NASA astronauts for an eventual mission to Mars. But as an expedition that was supposed to take weeks stretched into a two-year odyssey, the crew had to overcome seemingly insurmountable challenges and life-threatening conditions in order to realize their dreams of someday reaching the Red Planet.