While Steve Austin and Jaime Sommers plan their wedding, Oscar Goldman submits his bill for making Jaime Sommers a bionic woman: She is to go on her first assignment with her fiancé to switch a flawed U.S. $20 bill printing plate for a perfect copy in the possession of a foreign counterfeiter named Joseph Ronaugh. Steve Austin vehemently objects, but Jaime Sommers acknowledges her debt and agrees. The two succeed in their mission despite a malfunction in Jaime Sommer’s bionic arm which nearly causes it to fail. It is soon discovered that her body is rejecting the bionics. Dr. Rudy Wells conducts an emergency surgery to no avail. Jaime Sommers dies.
Steve Austin buys a ranch in his hometown of Ojai, California. He reunites with childhood friend Jaime Sommers who is now a professional tennis player. They rekindle a brief childhood romance. Jaime Sommers is injured in a skydiving accident when her parachute collapses toward the end of a jump. Her right arm, right ear, and both legs are severely injured. With Jaime’s life in peril, Steve Austin persuades a reluctant Oscar Goldman to fit her with bionics. Although skeptical at first, Jaime Sommers quickly acclimates to her mechanized components. The bond deepens between the two bionic humans. Steve Austin proposes marriage to Jaime Sommers, and she accepts.
When Oscar discovers that the construction of a top secret laser is being duplicated, he suspects that Harry Green, the expert overseeing the project, is a traitor. However, Steve disagrees and believes that Green's thoughts are being monitored through ESP. He obtains the help of Audrey Moss, also gifted with ESP, to track down the spy.
While Steve Austin is on a one week fishing vacation, a Steve Austin look-alike shows up at Oscar Goldman’s office claiming that he decided to cut his vacation short. He secretly takes photographs of the Omega Project files, which are turned over to a middleman named Breezy. The real Steve Austin returns just in time to catch his double getting a tour of the Omega Project facility. The impostor is hit by a car and killed in the ensuing pursuit. Steve Austin then poses as the impostor, a former boxer named John Dine who had his face surgically altered to resemble the bionic OSI agent. The search for the photographs eventually lands him in the ring of a crooked boxing promoter.
When a plane carrying an atomic warhead crashes on a South Pacific island, Steve is sent to retrieve it, but finds that an ex-Japanese Zero pilot, Kuroda, has taken it to his home. Steve must successfully navigate his way through the booby-traps and get the warhead before a rogue guerrilla group does.
An electrical short in Steve Austin’s bionic wiring causes him to crash land a plane in Colorado. Suffering from complete amnesia, he is taken in by a psychologist who is operating a home for the mentally depressed. Some locals in the town of Broken Fork do not want this home for “crazy” people in their community, and use strong-arm tactics to force it to move. Steven Austin gets embroiled in the controversy, amazing both himself and all witnesses with his seemingly inexplicable superhuman strength. As he searches for his true identity, Oscar Goldman leads a team trying to find his forgetful friend before his faulty wiring becomes fatal.
While Steve is helping a science team place earthquake sensors on the ocean floor, their boat is notified that the nearby country of Santa Ventura has broken off diplomatic relations with the US. Before their boat can leave the area they are captured by a Venturan patrol boat and Steve must help the team to escape.
A UFO carrying four anthropomorphic aliens seeking a new home on earth crashes into the ocean. The aliens manage to escape their lost vessel and swim ashore. Having witnessed the UFO’s flight, Steve Austin investigates a town close to the point of impact. Things quickly turn confrontational when physical contact between an alien and a human causes the alien to slowly die and the human to suffer radiation burns. Steve Austin befriends the aliens and attempts to assist the sole survivor in returning to her people before she dies. Despite astronomical odds, an impending rocket launch appears to be the only possible solution.