Steve is sent to the moon to investigate an orbital shift which is causing major upheavals in the Earth's climate. It turns out the upheavals are caused by a deranged scientist working at an exploration post on a nearby asteroid.

Steve is captured on the moon and is forced to help the scientist, who believes he's found a new energy source, and who threatens nuclear devastation on Earth if Steve refuses.

Steve poses as a newlywed with another OSI agent to uncover who broke into headquarters in search of an atomic bomb. Travelling via RV, their prey discovers the RV has a nuclear power source of its own and attempts to turn the tables.