Season
- Season 3 1959-09-18
- Season 2 1958-09-19
- Season 1 1957-09-20
Episode
- Episode 1: Ten Minutes to Doomsday
- Episode 2: The European Plan
- Episode 3: Sunday Punch
- Episode 4: Jeopardy by Fire
- Episode 5: Murder in C-Sharp Minor
- Episode 6: The Human Bond
- Episode 7: Mama's Boy
- Episode 8: Shred of Doubt
- Episode 9: Death by Adoption
- Episode 10: Another Face, Another Life
- Episode 11: Voice from the Grave
- Episode 12: The Upset
- Episode 13: One of Our Armored Cars Is Missing
- Episode 14: The Ivy League Bank Robbers
- Episode 15: The Twisted Way
- Episode 16: The Man Who Went Straight
- Episode 17: The Second Best Killer
- Episode 18: Pitched Battle at Bluebell Acres
- Episode 19: The Man Who Lost His Brain
- Episode 20: Debt of Honor
- Episode 21: The Man with Frank's Face
- Episode 22: Burglar's Nightmare
- Episode 23: Needle in the Haystack
- Episode 24: Race to Death
- Episode 25: The Velvet Stake-out
- Episode 26: Anything for Joe
- Episode 27: A Kid Up There
- Episode 28: Diary of a Bomber
- Episode 29: Let There Be Light
- Episode 30: A Gun for Mother's Day
- Episode 31: The Man with the Ice
- Episode 32: Dead Parrots Don't Talk
- Episode 33: Grenade for a Summer Evening
- Episode 34: Two Days for Willy
- Episode 35: Badge for a Coward
- Episode 36: Closed Season
- Episode 37: Fire in the Sky
- Episode 38: The Tiger's Cage
- Episode 39: The Bad Apple
M Squad
Lt. Frank Ballinger is a no-nonsense plain clothes cop in the elite M Squad Division. The Squad's task is to root out organised crime and corruption in America's Second City, Chicago.
