Summary:
A whole bunch of international astronauts are sent to the moon. Unfortunately, they screw up and wind up on Mars. They're attacked by some Martians (who look suspiciously like people in caveman getups), and most of them die. On the way back to Earth, the rest die. Yet the mission is declared a success.
Favorite line:
Lloyd Bridges and "By this time, my lungs were aching for air!"
Leonard Maltin gives it:
Summary:
This is apparently a sport. A guy on a motorcycle rides around with a guy on a sidecar made of plywood ond plumbing. The latter has to drag his butt on the ground to keep the bike and himself from falling over. Sadly, this did not make for quality cinema. There was a murder and some scheming, but it all was lost in the sight of guys dragging their butts on the ground.
Favorite line:
Their sports commentary during the race (done as a host segment).
Leonard Maltin gives it: 
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