An attractive district attorney asks Ray for help in dealing with a Mexican crime lord responsible for kidnapping and brainwashing several prominent people.
On the trail of a missing fieldworker Ray discovers a marijuana farm whose owners kill the workers when the harvest is over.
Ray goes undercover at a hospital as a surgeon to discover the cause of missing records for patients who are dying there under mysterious circumstances.
When a woman's husband disappears and everyone at the oceanic research lab he worked at claims not to know him, she turns to Ray for help.
Ray is brought in by the police, only to find out that the Captain, Nelson Riskin, wants to "hire" him, favor for favor. Riskin is being framed for his wife's murder. Helped by Riskin's assistant Candace, Ray goes undercover in a variety of guises. He eventually finds out that Riskin had incriminating information on a former Police Chief, Donald Dixon, who is now running for governor. Dixon and his squad of policemen framed Riskin. Ray escapes an execution squad, and reveals the evidence to Dixon's political backer. Dixon and his head goon try to escape, only to be stopped by Ray. At the end, Riskin is cleared but is unaware that Candace is romantically interested in him.
Ray is put on the defensive when an old enemy attacks him via college students who have been programmed to kill.
In order to substantiate claims that a Soviet helicopter is taking patients away from a mental hospital, Ray has himself committed there.
While relaxing at one of his favor-ower's homes, Ray finds himself drawn into a plan by an insane doctor to let loose a highly virulent strain of anthrax when one victim literally pulls up in front of the house. Fighting against time and the possibility of his own contagious infection, Ray dodges corrupt government officials trying to cover up the incident as he tries to prevent the scientist from infecting the local water supply with the anthrax.
When a series of brutal prostitute murders seem to follow a revival crusade around, Ray goes undercover as a minister and gets blamed for the latest murder.
After the head chemist at a pharmaceutical company hires Ray to look into lethal drugs being made for sale in Africa, he vanishes without a trace.
Women are mysteriously being murdered by a serial killer. Each of them advertised for help using an ad for a black Stingray Corvette, and the murderer drives around in a Stingray. One of Ray's former clients, a councilwoman, helps to bring him in. Ray pulls in a favor or two to get out of jail, and begins to investigate. He eventually finds out that an old friend from his mysterious past, Edward Benton, is trying to get revenge on him. During a mission in East Germany, Benton was left behind and imprisoned and tortured as a spy. Now he is seeking to even the score. Ray tracks him down and rather then let himself capture, Benton drives his car into a wall.
Ray recreates a space isolation experiment to try and clear an old friend of murder charges which stem from the fact he was the sole survivor of the first experiment.
A rather dimwitted garage worker and his criminal buddy steal $700,000 from a Mafioso who launders his money through the garage which he owns. The garage worker's sister is concerned that her brother is going to blow it: he doesn't seem to realize that quitting the day after you rob your boss and going crazy spending the money on coll stuff is a bad thing. She contacts Ray, who pretends to be another dimwitted crook and tries to get the two criminals out of trouble. The brother's buddy tries to double-cross them, and eventually despite Ray's best efforts to work things out, the sister is killed by the Mafioso Godfather. Her brother is left to mourn, as Ray warns him that he'll have to repay the favor his sister owed him.
An artist, a former client of Ray's, is getting threatening calls from a stalker who Ray helped her out with, years before. In fact, the guy apparently died during his final encounter with Ray the last time around. The trail leads to a relative of the first stalker who is trying to get revenge.
After a TV reporter who Ray refused to help is killed, Ray decides to find out what the man was working on.
Ray ends up in real trouble when he gets involved in a fantasy case made up by an author who needed an idea for his book.
Ray attempts to resolve a dispute between a land developer and Indians who claim the proposed building site is on sacred ground.
Ray helps a retarded man by going undercover as a dock worker at the dock where his father was killed in a suspicious accident.
Ray goes undercover as an instructor at a military academy to help a student who witnessed his classmates commit murder.
Ray gets drawn into a case of a drugged-up TV star, Ty Gardiner, who tries to hire him despite Ray's misgivings. Turns out Gardiner's name and celebrity were used by his unscrupulous partner to rip off both the Mafia and the Yakuza. Now that the partner has disappeared, Gardiner is left holding the bag with both sides trying to kill him, and the Feds looking for him as well. Ray's attempts to negotiate the matter aren't helped by Gardiner, who fancies himself the big dramatic hero that he plays on TV. Ray manages to set up both the Mafia and the Yakuza to shoot it out with each other, using Gardiner as bait so that he isn't wanted by the Feds. In the subsequent shootout Ray and Ty both end up in hospital beds, with Gardiner hatching another nutty scheme.
Ray helps the principal of an urban high school prevent a gang war from erupting.
Ray travels to Vietnam where an exploding bomb blinds him, hindering his search for a statue which can provide clues to the whereabouts of American MIA's.
Ray must rescue the father of a Soviet defector who is being held captive by the Russians in the hold of an ocean liner.
Ray comes to the aid of a crop duster pilot who gets caught in the middle when two rival marijuana growers insist that he poisoned the other's fields.
