AllMovie

Discovering that Mars has briefly spun off its regular orbit and is closer to the Earth than usual, Martin (Ray Walston) feels that time is ripe to attempt a return trip to his home planet. Alas, on the eve of his takeoff, Martin suffers a bad fall and ends up in the hospital. With only a 10-hour window at his disposal, Martin must gain a quick discharge, but can only do so if he agrees to submit to a fluoroscope--which of course would instantly reveal his true Martian identity!