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1. 

   Peter Falk

   Columbo

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1. 

   Robert Walker Jr.

   Neil Cahill

2. 

   Lou Wagner

   Ross

3. 

   Lew Ayres

   Howard Nicholson

4. 

   Lee Montgomery

   Steve Spelberg

5. 

   William Christopher

   Male Scientist

6. 

   Jessica Walter

   Margaret Nicholson

7. 

   John Zaremba

   Coroner

8. 

   José Ferrer

   Marshall Cahill

9. 

   Arthur Batanides

   Murph

10. 

    Darrell Zwerling

    Motel Manager

11. 

    Charles Macaulay

    Farnsworth

12. 

    William Bryant

    Fields

13. 

    Bert Holland

    Whitehead

14. 

    Ed Fury

    Plainclothesman

15. Jefferson Kibbee

    Jeff

16. 

    Dianne Turley Travis

    Lady Scientist

17. 

    Deidre Hall

    Receptionist

18. Dennis Robertson

    Reporter #1

19. Luis Moreno

    Officer

20. Ray Ballard

    2nd Reporter (uncredited)

21. 

    Don Diamond

    Portland Desk Clerk (uncredited)

22. 

    Mike Lally

    Scientist (uncredited)

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