Premiered 1957-1960. The hardhitting adventures of tough Lieutenant Frank Ballinger, a member of the Chicago Police Department's M Squad, an elite crimefighting unit.

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Season 3

39	The Bad Apple	Jun. 21, 1960
38	The Tiger's Cage	Jun. 14, 1960
37	Fire in the Sky	Jun. 7, 1960
36	Closed Season	May 31, 1960
35	Badge for a Coward	May 24, 1960
34	Two Days for Willy	May 17, 1960
33	A Grenade for a Summer's Evening	May 10, 1960
32	Dead Parrots Don't Talk	May 3, 1960
31	Man with the Ice	Apr. 19, 1960
30	A Gun for Mother's Day	Apr. 12, 1960
29	Let There Be Light	Apr. 5, 1960
28	Diary of a Bomber	Mar. 29, 1960
27	A Kid Up There	Mar. 22, 1960
26	Anything for Joe	Mar. 15, 1960
25	The Velvet Stakeout	Mar. 8, 1960
24	Race to Death	Mar. 1, 1960
23	Needle in a Haystack	Feb. 23, 1960
22	Burglar's Nightmare	Feb. 16, 1960
21	The Man with Frank's Face	Feb. 9, 1960
20	A Debt of Honor	Feb. 2, 1960
19	The Man Who Lost His Brain	Jan. 26, 1960
18	Pitched Battle at Bluebell Acres	Jan. 22, 1960
17	The Second Best Killer	Jan. 15, 1960
16	The Man Who Went Straight	Jan. 8, 1960
15	The Twisted Way	Jan. 1, 1960
14	The Ivy League Bank Robbers	Dec. 25, 1959
13	One of Our Armored Cars Is Missing	Dec. 18, 1959
12	The Upset	Dec. 11, 1959
11	Voice from the Grave	Dec. 4, 1959
10	Another Face, Another Life	Nov. 27, 1959
9	Death by Adoption	Nov. 20, 1959
8	Shred of Doubt	Nov. 6, 1959
7	Mama's Boy	Oct. 30, 1959
6	The Human Bond	Oct. 23, 1959
5	Murder in C-Sharp Minor	Oct. 16, 1959
4	Jeopardy by Fire	Oct. 9, 1959
3	Sunday Punch	Oct. 2, 1959
2	The European Plan	Sep. 25, 1959
1	Ten Minutes to Doomsday	Sep. 18, 1959

Season 2

40	Death Is a Clock	Jul. 3, 1959
39	The Platter Pirates	Jun. 26, 1959
38	Mr. Grim's Rabbits	Jun. 19, 1959
37	Decoy in White	Jun. 12, 1959
36	The Dangerous Game	Jun. 5, 1959
35	High School Bride	May 29, 1959
34	The Outsider	May 22, 1959
33	Model in the Lake	May 15, 1959
32	The Baited Hook	May 8, 1959
31	Robber's Roost	May 1, 1959
30	The Terror on Dark Street	Apr. 24, 1959
29	The Fire Makers	Apr. 17, 1959
28	The Crush Out	Apr. 10, 1959
27	The Vanishing Lady	Apr. 3, 1959
26	Ghost Town	Mar. 27, 1959
25	The Harpies	Mar. 20, 1959
24	Death Threat	Mar. 13, 1959
23	Voluntary Surrender	Mar. 6, 1959
22	The Take Over	Feb. 27, 1958
21	The Star Witness	Feb. 20, 1959
20	Mugger Murder	Feb. 13, 1959
19	The Last Act	Feb. 6, 1959
18	The Jumper	Jan. 30, 1959
17	One Man's Life	Jan. 23, 1959
16	The Third Shadow	Jan. 9, 1959
15	The Teacher	Jan. 2, 1959
14	Prescription for Murder	Dec. 26, 1958
13	Contraband	Dec. 19, 1958
12	The Widows	Dec. 12, 1958
11	The Executioner	Dec. 5, 1958
10	The Sitters	Nov. 28, 1958
9	The Big Kill	Nov. 21, 1958
8	The Merits of the Case	Nov. 14, 1958
7	The Phantom Raiders	Nov. 7, 1958
6	Force of Habit	Oct. 31, 1958
5	The Trap	Oct. 24, 1958
4	The Refugee	Oct. 10, 1958
3	The Missing Claimant	Oct. 3, 1958
2	Dead or Alive	Sep. 26, 1958
1	More Deadly	Sep. 19, 1958

Season 1

38	Accusation	Jun. 13, 1958
37	The Woman from Paris	Jun. 6, 1958
36	The System	May 30, 1958
35	The Case of the Double Face	May 23, 1958
34	The $20 Plates	May 16, 1958
33	Day of Terror	May 9, 1958
32	The Healer	May 2, 1958
31	Guilty Alibi	Apr. 25, 1958
30	The Fight	Apr. 18, 1958
29	The Twenty-Six Girl	Apr. 11, 1958
28	Shot in the Dark	Apr. 4, 1958
27	Hideout	Mar. 28, 1958
26	Girl Lost	Mar. 21, 1958
25	The Chicago Bluebeard	Mar. 14, 1958
24	The Man in Hiding	Mar. 7, 1958
23	The Black Mermaid	Feb. 28, 1958
22	The Frightened Wife	Feb. 21, 1958
21	Lover's Lane Killing	Feb. 14, 1958
20	Dolly's Bar	Feb. 7, 1958
19	The Shakedown	Jan. 31, 1958
18	The Long Ride	Jan. 24, 1958
17	Blue Indigo	Jan. 17, 1958
16	The Cover Up	Jan. 10, 1958
15	The Slow Trap	Jan. 3, 1958
14	The Palace Guard	Dec. 27, 1957
13	Family Portrait	Dec. 20, 1957
12	The Specialists	Dec. 13, 1957
11	The Alibi Witness	Dec. 6, 1957
10	Diamond Hard	Nov. 29, 1957
9	Killer in Town	Nov. 22, 1957
8	The Hard Case	Nov. 15, 1957
7	The Matinee Trade	Nov. 8, 1957
6	Street of Fear	Nov. 1, 1957
5	Face of Evil	Oct. 18, 1957
4	Pete Loves Mary	Oct. 11, 1957
3	Neighborhood Killer	Oct. 4, 1957
2	The Watchdog	Sep. 27, 1957
1	The Golden Look	Sep. 20, 1957