While Steve's away on vacation, a man who has been surgically altered to resemble Steve, goes into Oscar's office and photographs every classified material there is. Someone tries to kill Steve but Steve evades them. Steve returns just as Oscar and the false Steve are leaving a secret facility, which he photographed. The imposter tries to run away but is run over by a car. Steve then decides to assume his identity so that he can recover what he photographed.
When Oscar discovers that the construction of a top secret laser is being duplicated, he suspects Harry Green, the expert overseeing the project, is a traitor. Steve believes that he is not a traitor, but that his thoughts are being monitored through ESP. He obtains the help of Audrey Moss, also gifted with ESP, to track down the ESP spy.
When Steve returns to his hometown, he runs into Jaime Sommers, his former girlfriend. The romance is rekindled and they quickly get enganged. While the two are skydiving, Jaime's parachute gets tangled and has a near fatal accident. To help save her life and another chance at a normal life, Steve pleads with Oscar to let Rudy operate on her and give her bionics.
With Jaime adjusting to her bionics, Oscar wants to use Jaime to infiltrate a counterfit ring and steal the counterfit plates lock in their vault. Steve is adamantly opposed, but Jaime's bionic hearing is the only way to successfully open it the vault. Jaime's body seems to be rejecting her bionics, but does not tell anyone. After the mission the rejection worsens and leads her to run aimlessly. Steve tracts her down and brings her to Rudy, but there is nothing he can do and Jaime dies.
Revolutionaries kidnap the wife of the US Ambassador to the nation of Balinderry. In exchange for her release the revolutionaries want the fellow revolutionaries that are imprisoned to be freed. With the help of Julia Flood, his liason with the kidnappers, Steve attempts to rescue the ambassador's wife.
Steve's bionic leg is damaged during a mission and must have it repaired. While semi-conscious and on his way into surgery he sees Jaime. Steve learns that Jaime did not die as he was led to believe, but was kept alive with cryogenic techniques by one of Rudy's assitants, Michael Marchetti. Jaime has just awakened from the cryogenic coma and suffers from memory loss resulting from mild brain damage.
In an attempt to restore Jaime's memory, he takes back to their hometown of Ojai. She again begins to have violent headaches. Oscar sends Steve and Jaime on a mission hoping to give Jaime some relief. The mission fails because of Jaime's condition and they return to Washington. Steve ultimately concludes that it is he who is causing Jaime's headaches and suggests Jaime be moved away from him to Rudy's Colorado Springs facility so she can fully recover.
An ex-government employee feels the government owes him something since he was laid off due to cutbacks and has been unemployed since. He rigs the liberty bell, which is on tour around the country due to the bicentennial celebration, to explode unless he gets $5 million dollars and safe passage out of the country. Steve and Oscar must rely on an explosive expert who is in prison to defuse the bomb.
Barney Miller, the seven million dollar man, is reactivated. Having apparently recovered, he's eager to resume auto racing. However, when the team owner won't let him race, Barney attacks the man and mistakenly believes he's killed him. Barney has a mental break from the stress and goes on crime spree, and Steve must track him down.
When a scientist who defected to Russia for love wants to return to the United States, Steve is assigned to bring him back. Knowing only life in Russia, the scientist's son is hesitant to join, and by the time Steve convinces him to come along, the Russians learn of their plan and block their escape route, forcing a more dangerous alternative to be used.
After going through another operation, Jaime Sommer's memories are slowly resurfacing. Now she is ready to move back to Ojai and live near her foster parents, Jim & Helen Elgin. Oscar Goldman arranges a job for her as a teacher at the Ventura Air Force base school but Jaime also insists on taking on missions of the OSI.
The alien race that Steve fought before (in "The Secret of Bigfoot") need supplies of metal and jewels and send their Bigfoot android to steal them from U.S. government depots. Seeing the results of the unseen android's efforts, the authorities conclude Steve is responsible and arrest him. To clear his name, Steve must escape and track down the aliens.
Steve is present at the test flight of his friend Kelly Wood when she is shot down by a World War II Japanese Zero! Later Kelly is found but the plane has vanished and she's suspected of selling it to a foreign concern. Steve must clear her name and discovers a sinister plot to steal top-secret aircraft.
Steve and Rudy go to check up on a scientist, Cheryl Osborne, who was doing research on chimpanzees but who has ceased communications. When they arrive they find something has destroyed the lab, and Rudy is bitten by a rampaging chimpanzee. Rudy begins to turn into a psychotic and Steve must both stop him and find Osborne before it's too late.
This is part of a three part crossover with The Bionic Woman. With Jaime Sommers critically injured, Steve Austin races to Dr. Franklin's secret hideout to find the kidnapped Oscar Goldman. Austin plans to rescue his friend and boss despite Oscar's own orders to kill him lest he spill state secrets. (originally aired as The Six Million Dollar Man, Season 4, Episode 6)
Steve and Jaime become Oscar and Callahan's only hope of survival when Franklin uses the weather control machine to repel a military strike force from his island.
other characters: Sissy Crandall (Bob's other daughter) When Steve is sent to investigate problems with an OSI project contracted out to Budge Corp., he discovers the problem is that the corporation's owner, Horton Budge, is a cheap ""Scrooge"". Steve then uses the same strategy from the Charles Dickens classic.
The Soviets have created an experimental Venus probe out of a new alloy, but it crashes in Wyoming. Thinking it's on Venus, the probe prepares to destroy a small town. The Russians send a team of agents in to recover it, while the OSI is desperate to stop it before it kills. Complications arise when it becomes clear the probe is stronger then Steve.
Danny, a 14 year old kid, inadvertently creates a source of chemical thermal energy source while trying to create a new fuel source for his toy rocket. When his chemicals are stolen from his garage laboratory, Steve and OSI must protect Danny and catch the thief before he sells it on the black market.
Steve is assigned to gain the confidence of a scientist who has developed a weapon to capture soldiers non-violently, but refuses to hand over the plans to anyone for fear it could cause drastic results if used on a pilot in flight. As Steve begins to become his friend and acquire the weapon, the Russians inform the scientist they are holding his wife hostage and demand the device in trade for her safe return.
Steve enters a time warp while on an orbital mission, hurling him six years into the future. Upon landing, the authorities arrest him for treason, believing he defected to Russia and was brainwashed into thinking the time warp occurred. Steve has to both prove his innocence and figure out how to get back to his own time.
While searching for a fallen satellite in the Pacific, Steve rescues a drowning victim who turns out to be an alien. She offers to help him acquire the satellite, which has landed on her race's invisible island. However, many of the island's populace in fear of a revolution, yet are unable to leave due to a lack of an immune system to Earth illnesses. Steve must get an experimental serum for her before she will help him.
While Steve helps a countess retrieve a microdot with important information hidden on a painting in a museum, she helps herself to a masterpiece and replaces it with a forgery. Oscar sends Steve to retrieve the painting from its buyer before a visiting art expert causes embarrassment by discovering the counterfeit currently on display.
When OSI's communications chief is accused of spying, Steve attempts to prove his innocence and discovers tampered computer memory. He is led to suspect a computer dating service is behind the ilegal activity, but doesn't realize a computer itself has gained sentience and plans to stop Steve any way it can.
Steve teams with the owner of the computer dating service to put a stop to her now-sentient computer. After escaping a computer-arranged assassination, Steve finds himself in a mental facility after his medical records are altered. While the computer attempts to have everyone who knows about it killed, Steve must find a way to escape and stop the computer before it's too late.
Ten years after his retirement from the government, Colonel Steve Austin must again team up with Jaime Sommers to stop a terrorist group. Complicating matters for Austin are his estranged son Michael, who struggles for his father's acceptance as he graduates from flight school, and Jamie, who must cope with her and Steve's past. When Michael is severely injured in a crash, Steve must make the same decision about fitting him with bionics that he had to make with Jaime years ago after her accident.
Steve Austin and Jamie Summers are about to get married. However, before they can something is happening to Jamie; it seems like her bionics are failing and no one knows what's wrong with her. It seems that someone has been doing something to her, who and why? At the same time an old friend of Steve's is being held prisoner by some terrorists and Steve, needing to take his mind of Jamie, offers to go and help.