Jere Beery
Photographer (uncredited)Mike Doyle
Cop (uncredited)Jack Gargan
Skipper (uncredited)Charles Gibb
Cop (uncredited)Tom Hennesy
The Gill Man (on land) / Marineland Diver (uncredited)Don House
Diver (uncredited)Ned Le Fevre
Newscaster (uncredited)Sydney Mason
Police Announcer (uncredited)Robert Nelson
Dr. McCuller (uncredited)Patricia Powers
Girl in ConvertibleBert Stevens
Search Party Member (uncredited)Charles Victor
Policeman (uncredited)Robert Wehling
Joe (uncredited)James R. Wolfe
Man at Tank (uncredited)