Ralph Bellamy plays a Governor up for re-election. To ensure his victory he fakes an assassination attempt on him and then tries to hoodwink the Checkmate team.

Tony Randall plays a cunning convict who has an "infallible plan" to break out of prison. Checkmate put a team member undercover in prison, to thwart him.

Dorothy Malone plays a woman married to an older man, running a vacation Lodge. The Lodge's handyman, played by Ed Nelson,is an ex lover of Malone and he has devious plans for her husband to meet with a deadly 'accident'.

Claire Bloom plays a photo journalist who takes some pictures of those in the vice trade. She is blinded by acid from the culprits. Checkmate are called in to unravel the murky events

A migrant worker is accused of killing an agricultural businessman. The hard nosed District Attorney, played by Henry Jones is sure of his guilt. The checkmate team, called in to investigate, are not so convinced.

Sid Caesar, plays a emotionally disturbed disc jockey who had made a few enemies in his career. He is convinced someone is out to kill him and hasn't left the studio for two weeks. Checkmate are called in to investigate.

Vera Miles plays a painter caught up with her sculptor husband forging paintings. Blackmail and murder soon ensue.

Lloyd Bridges plays a successful construction engineer, who thinks his twin brother (also played by Bridges) is out to kill him, for firing him from the business, five years previously.

James Whitmore plays a disgruntled precinct captain passed over for promotion. He blames an old high school rival and plots his revenge by framing him for a murder.

Laraine Day, plays a woman with amnesia who doesn't recognize her husband when discharged from hospital. It is up to Checkmate's Dr Hyatt (Sebastian Cabot) to untangle the mystery.

Jack Bowen (basically Jack Benny playing himself) is Grand Marshal of the Pioneer Bowl. After he finds a time bomb in his briefcase, he calls Checkmate to help him. *SPOILER ALERT* Midwest wins the Pioneer Bowl 42-0.

Movie star Vicky Page is accused of trying to murder an actress who's having an affair with her boyfriend. Jed Sills is hired by the studio for public relations and to keep an eye on the suicidal actress.

A worker at a luxury women's spa is threatened when her former boyfriend is released from prison.

A young man who has just won an art contest learns that his father has been arrested for embezzling from his company. Now Checkmate must find a good influence who can stop him from turning violent.

After a prominent attorney and president of a yacht club board is nearly killed in an auto accident, the manager of the club calls in Checkmate suspecting foul play.

Famous defense attorney John Baker arranges for his own assassination after receiving notice that he is about to be investigated by the bar association, but then changes his mind.

A theatrical actress consults Checkmate after her husband and stage star is nearly killed in an apparent accident during a rehearsal.

Checkmate is hired by the director of a music conservatory that fronts for an Eastern Bloc freedom movement to protect his cello instructor who has been targeted for assassination.

Checkmate tries to prevent a woman who was convicted and jailed for treason from returning to her former crimes.

Jed goes undercover at a hobo camp to prevent the leader from being murdered.

The son of a wealthy industrialist killed in a gun accident believes that it may have been murder.

Carl Hyatt gets held up at a Monastery where he has an encounter with two hoodlums who threaten to kill a few of the priests that work at the Monastery he is held up at.

The girlfriend of a rodeo rider calls in Checkmate because she is worried her social-climbing brother will try to harm him.

A wealthy art patroness who runs s home for struggling artists asks Checkmste to investigate when she receives death threats. Suspicion falls upon her three boarders.

A university-affiliated psychiatrist hires Checkmate to prevent his wife from killing a man who is allegedly blackmailing her.

Checkmate is hired by the wife of a newspaper editor whose life is threatened because he opposes a local referendum that would legalize gambling.

A former football star always looking for the next big windfall gets into serious trouble with the mob, who want him to influence his young protege to shave points in the next big football game.

A married wealthy industrialist being considered for the position of Overseas Director at a large philanthropic organization calls Checkmate after threats are made against the woman with whom he is having an affair.

A cut-throat investor hires Checkmate to protect an incorporated ranch owner after someone takes a shot at him just before a crucial board meeting.

Three brothers due to inherit an equal split of $40 million hire Checkmate to prevent themselves from killing each other.

Checkmate is called in by a convention manager when one of her guest speakers vanishes and it appears he may have been a victim of blackmail.

Record label A&R man Chuck Palmer calls in Checkmate after the arrogant younger half of his hit vocal duo starts receiving threats for his escapades with married women.