Cast
Prof. Clete Ferguson
Helen Dobson
Joe Hayes
Lucas
Jackson Foster
Lou Gibson
George Johnson
Captain of PoliceWoman on Boat, not listed in creditsа Photographer, not listed in credits 
The Gill Man - In Water / Lab Technician, not listed in creditsMiss Abbott, not listed in creditsа Cop, not listed in credits 
Jennings, not listed in credits
Skipper, not listed in creditsCop, not listed in credits 
Pete, not listed in credits
Mac - Spotlight Party Leader, not listed in credits
The Gill Man (on land) / Marineland Diver, not listed in creditsMinor Role, not listed in credits 
Charlie, not listed in creditsNewscaster, not listed in credits Police Announcer, not listed in credits Dr. McCuller, not listed in credits Girl in Convertible, not listed in creditsа 
Search Party Member, not listed in creditsCop, not listed in credits 
Joe, not listed in credits
