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.
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Lee Marvin
Detective Lt. Frank Ballinger (117 episodes)

Paul Newlan
Police Capt. Grey (117 episodes)

DeForest Kelley
Police Sgt. Miller (2 episodes)Detective (1 episode)

Harry Landers
Max Decker (1 episode)Torrance (1 episode)

Dan Tobin
Steve Lanley (2 episodes)

Barney Phillips
Doctor (1 episode)Dr. Lester Bowers (1 episode)

Elizabeth Harrower
Mrs. Michaels (1 episode)Walls' Secretary (1 episode)

Bill Erwin
Detective Gene (1 episode)Roger Jessop (1 episode)

William Hudson
Tom Ferris (1 episode)Paul Webster (1 episode)