M = mördaren

David Wayne

Martin W. Harrow

Howard Da Silva

Inspector Carney

Martin Gabel

Charlie Marshall

Luther Adler

Dan Langley

Steve Brodie

Police Lt. Becker

Raymond Burr

Pottsy

Glenn Anders

Riggert

Norman Lloyd

Sutro

Walter Burke

MacMahan

John Miljan

Blind Baloon Vendor

Roy Engel

Police Chief Regan

Janine Perreau

The Last Little Girl

Leonard Bremen

Lemke (as Lennie Bremen)

Benny Burt

Jansen

Bernard Szold

Bradbury Bldg. Watchman

Robin Fletcher

Elsie Coster