A remarkable new underwater breathing device with bigger implications and powered by nuclear fusion attracts the attention of a dangerous spy network. With an invented identity as a doctor on the project, Steve attempts to outwit the spies by faking the device's capabilities with a little help from his bionic arm.

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 investigates his girlfriend's disappearance while she was piloting a new plane with anti-radar technology. He discovers one of the plane's technicians has been talking to a known trader of military secrets and starts the search for further clues.