Ralph Byrd (Dick Tracy)
Boris Karloff (Gruesome)
Lyle Latell (Pat Patton)
Anne Gwynne (Tess Trueheart)
June Clayworth (Dr. I.M. Learned)
Skelton Knaggs (X-Ray)
Anne Jeffreys (Actor/Actress)
Morgan Conway (Actor/Actress)
Edward Ashley (Dr. Lee Thal)
Bela Lugosi (Actor/Actress)
Jim Nolan (Dan Sterne)
Robert Clarke (Fred, police analyst)
Milton Parsons (Dr. A. Tomic)
Harry Harvey, Jr. (Humphrey, a guard)
William Gould ("Pop", hospital desk sgt.)
Ernie S. Adams (Bartender at Hangman's Knot)
Phil Arnold (Sneezing customer)
Lex Barker (City hospital driver)
Sean McClory (Officer Carney)
Lee Phelps (Detective in car)
Bert Roach (Crandall, a customer)
Jason Robards, Sr. (Mr. Fax, bank vice pres.)
Harry Strang (Officer Tim)
Tony Barrett ("Melody" Fiske)
Joseph Crehan (Brandon)