On the Moon the US and Soviets are in an informal race to be the first to Mars. Both sides play down the need to rush with concerns about safety. Ultimately both missions launch within minutes of each other, but a terrible accident completely changes the game and the ultimate fate of both crews.

The crew of MR37 encounter a strange object that they first believe is a meteor till it starts changing direction to match their ship. Whatever the object was it is confirmed it could not have come from Earth. When MR30 also encounters the object, a desperate chase begins to try and identify it.