John Finnegan
Guard, Barney, Workman #1, Sergeant, Police Chief, Lieutenant Dreyer, Carl, Quentin Corbett, Assistant Director, Sean Jarvis
Bruce Kirby
Phil Brindle, Lab Attendant, Sergeant Kramer, TV Repairman
Mike Lally
Bartender #2, Waiter (uncredited), Michael Lally (uncredited), Parking Lot Guard (uncredited), Scientist (uncredited), TV Cameraman, Security Guard (uncredited), Police Photographer (uncredited)
Shera Danese
Cathleen Calvert, Geraldine Ferguson, Eve Plummer, Trish Fairbanks, Vanessa Barsini, Molly
Vito Scotti
Vito, Maitre D', Salvatore De Fonte, Thomas Dolan, Mr. Grindell, Chadwick
Ed McCready
Detective #2, Plainclothesman, Security Guard, Man in Bar, Ed
Robert Culp
Bart Kepple, Jordan Rowe, Investigator Brimmer, Paul Hanlon
Patrick McGoohan
Eric Prince, Nelson Brenner, Oscar Finch
Val Avery
Artie Jessup, Ralph Dobbs, Harry Barnes
Fred Draper
Joseph, Murcheson, David Morris, Swanny Swanso
Dianne Turley Travis
Lady Scientist, Club Member (uncredited), Greta, Executive (uncredited)
Gerry Okuneff
Patrolman, Plainclothes Detective, Dealer, Walter Sterling
Bob Harks
Bar Patron (uncredited), Waiter (uncredited), Chauffer (uncredited), Policeman (uncredited)
Jack Cassidy
Ken Franklin, Riley Greenleaf, The Great Santini
Cliff Carnell
Plainclothesman, Photo Shop Man, Officer Wilson
Milt Kogan
Dubbing Chief, Medical Examiner
Robert Donner
Arnie, Drunk, Zeke Rivers
Victor Izay
Conroy, Lassiter, Medical Examiner
Richard Stahl
Ballistics Man, Mr. Fremont, Burton (as Dick Stahl)
Jimmy Joyce
Camera Operator, Workman, Handwriting Expert
Manuel DePina
Reporter #2, Photographer, Detective #1
Alan Fudge
David Chase, Mr. Harrow, Mr. Redman
Stewart J. Zully
Investigator #3, Sergeant Burke, Sewell
Bill Zuckert
Father, Captain August, Captain Sampson
Dennis Robertson
Reporter #1, Jerry, Detective Marley
Cosmo Sardo
Club Member (uncredited), Party Guest (uncredited), Executive (uncredited)
Morgan Jones
Crime Lab Man, Lab Technician, Wilson
John Petlock
Male Guest, Medical Examiner, Plainclothesman #2
Ray Ballard
2nd Reporter (uncredited), Mr. Williams (uncredited), Gardener (uncredited)
George Hamilton
Mark Collier, Wade Anders
Dabney Coleman
Hugh Creighton, Detective Murray
Jeanette Nolan
Kate O'Connell, Mrs. Peck
