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Broderick Crawford
John 'Ripley

Ruth Roman
Kate Martell

Martha Hyer
Connie Anderson

Marisa Pavan
Julie Angelino

Max Showalter
Dave Millson

Kenneth Tobey
Zack Stewart

Gene Reynolds
Vince Angelino

William Johnstone
FBI Chief Frank Pace

Harlan Warde
Greg Barker

Jay Adler
Uncle Max - aka Charles Martell

Claude Akins
Matty Pavelich

Suzanne Alexander
Brenda Ralles

Myra Marsh
Mrs. Downes

Joe Bassett
Joe Walpo - aka Joe Allen

Alan Dexter
Lt. Jake Kuppol