Aboard the first spacecraft designed to handle a landing on Mars, three astronauts on a seemingly routine planetary space exploration mission receive a signal transmission from a probe on Mars via Earth that will drastically change their course of action. Upon landing on Mars, the team find a device that sends them back to a time when the sinister Siperion Empire controlled Mars. The astronauts must relocate the device in order to escape Siperion and return to their own time.