Ηθοποιοί επεισοδίου
Peter FalkLt. Columbo
Robert Walker Jr.Neil Cahill
Lou WagnerRoss
Lew AyresHoward Nicholson
Lee MontgomerySteve Spelberg
William ChristopherMale Scientist
Jessica WalterMargaret Nicholson
John ZarembaCoroner
José FerrerMarshall Cahill
Arthur BatanidesMurph
Darrell ZwerlingMotel Manager
Charles MacaulayFarnsworth
William BryantFields
Bert HollandWhitehead