Jim McConnel (Gary Sinise) is launched towards the new Martian homeworld in a starship left behind by the Martians, our progenitors, who made a mass exodus of the solar system after the Martian ecosystem was destroyed by an asteroid impact. It turns out that they had the chutzpah to contaminate the virgin Earth with their own genetic material before they left. Meanwhile, the remaining astronauts survive by lifting off from Mars with just seconds to go in their launch window.
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