Characters played by J. Carrol Naish
Dr. Igor Markoff
Characters played by Ralph Morgan
Anthony Lawrence
Characters played by Tala Birell
Maxine
Characters played by Wanda McKay
Patricia Lawrence
Characters played by Terry Frost
Bob Blake
Characters played by Glenn Strange
Giant
Characters played by Alexander Pollard
Butler
Characters played by Sam Flint
Dr. Adams
Characters played by Ace the Wonder Dog
Ace
Characters played by Ray Corrigan
Gorilla