In an attempt to steal a top secret anti-missile device, Steve's associate and friend Major Sloan is kidnapped and replaced with a robot. Steve must discover the impostor, and keep the device from being stolen and sold to the highest bidder.

When an earthquake threatens the stability of an underground Russian nuclear installation, Steve must rescue the fiance of his friend Col. Vasily Zhukov, who is buried beneath debris. Complicating matters further, Steve must also stop the reactor before it explodes.

When America's first female astronaut (guest star Farrah Fawcett) runs into trouble, Steve tries to help, but discovers that his powers are limited by space travel.

When a terrorist uses a laser to try to kill a group of prime ministers attending an international meeting in Paris, Steve is assigned to infiltrate his compound and stop him.

When an earthquake in the Himalayas uncovers a DC-3 plane containing secret papers that went down during World War II, Steve is sent to recover the papers. Steve also tries to clear the name of the pilot, his father, who was accused of bailing out and leaving the rest of the crew to die.