S1E1 - Death Runs Wild
Story tells of a demented woman out to kill private eye Anthony George. The instrument of death, as it turned out, was, a wild stallion she stocked on her ranch. Her motive was revenge. On a previous case, the private eye had brought her lover to justice and the gas chamber.
Sept. 17, 1960, midnight
S1E2 - Interrupted Honeymoon
Sept. 24, 1960, midnight
S1E3 - The Cyanide Touch
Oct. 1, 1960, midnight
S1E4 - Lady on the Brink
Checkmate comes to the aid of a woman with a traumatic past when it becomes evident that someone is trying to make it appear she's mentally unstable. discrediting her eye-witness testimony at a murder trial.
Oct. 15, 1960, midnight
S1E5 - Face in the Window
Oct. 22, 1960, midnight
S1E6 - Runaway
Oct. 29, 1960, midnight
S1E7 - Target: Tycoon
Nov. 5, 1960, midnight
S1E8 - The Deadly Shadow
Nov. 12, 1960, midnight
S1E9 - The Dark Divide
Barbara Rush plays a dual role in The dark divide. Why should Margaret Russell's life be threatened? Her aunt keeps getting phone calls from a woman named Nikki Garnett, threatening Margaret. What motive could the woman have?
Nov. 19, 1960, midnight
S1E10 - Moment of Truth
Nov. 26, 1960, midnight
S1E11 - The Mask of Vengeance
Dec. 3, 1960, midnight
S1E12 - The Murder Game
Attorney Emory Olivant invites Corey, Sills and Dr. Hyatt to a party. Once all the guests have arrived, Olivant announces that they are going to play a game—a murder game in which he will be the killer.
Dec. 17, 1960, midnight
S1E13 - The Princess in the Tower
Dec. 31, 1960, midnight
S1E14 - The Terror from the East
Jan. 7, 1961, midnight
S1E15 - The Human Touch
Arguably the finest episode of the series, featuring guest star Peter Lorre as an ex-con criminal mastermind determined to wreak revenge on master criminologist Sebastian Cabot. An intricate series of cat and mouse moves between the two geniuses culminates in a surprise and ultimately poignant ending, befitting the episode title. This episode stresses the close friendships between the three detectives of CHECKMATE INCORPORATED as it contrasts with that of the brilliant, but soulless Lorre. Directing, writing and acting are all exemplary.
Jan. 14, 1961, midnight
S1E16 - Hour of Execution
Jan. 21, 1961, midnight
S1E17 - Don't Believe a Word She Says
Jan. 28, 1961, midnight
S1E18 - Laugh Till I Die
Feb. 4, 1961, midnight
S1E19 - Between Two Guns
Feb. 11, 1961, midnight
S1E20 - A Matter of Conscience
Feb. 18, 1961, midnight
S1E21 - Melody for Murder
Feb. 25, 1961, midnight
S1E22 - Phantom Lover
March 4, 1961, midnight
S1E23 - The Gift
Lola Tuscany, a temperamental lady soprano, is having premonitions of her death. After her concert she is almost poisoned and Checkmate Inc. is hired to keep her safe. Don Corey is skeptical, believing it is a publicity stunt, until he is nearly killed when a bomb explodes in the car he and Lola are driving in.
March 11, 1961, midnight
S1E24 - One for the Book
March 18, 1961, midnight
S1E25 - The Paper Killer
March 25, 1961, midnight
S1E26 - Jungle Castle
April 1, 1961, midnight
S1E27 - The Deadly Silence
April 8, 1961, midnight
S1E28 - Goodbye Griff
""Ex-convict Griff Nolan is jealous because his wife Libby earns more as a magazine editor than he does as a mechanic. More domestic strife develops when Griff becomes jealous of Libby's boss Lewis Bates --- and buys a gun.""
-- TV Guide
April 15, 1961, midnight
S1E30 - Voyage Into Fear
May 6, 1961, midnight
S1E31 - Tight As a Drum
May 13, 1961, midnight
S1E32 - Death by Design
May 20, 1961, midnight
S1E33 - The Thrill Seeker
May 27, 1961, midnight
S1E34 - Hot Wind in a Cold Town
June 10, 1961, midnight
S1E35 - A Slight Touch of Venom
June 17, 1961, midnight
S1E36 - State of Shock
June 24, 1961, midnight