John Agar

Prof. Clete Ferguson

Lori Nelson

Helen Dobson

John Bromfield

Joe Hayes

Nestor Paiva

Captain Lucas

Grandon Rhodes

Jackson Foster

Dave Willock

Lou Gibson

Robert B. Williams

George Johnson

Charles Cane

Captain of Police

Loretta Agar

Woman on Boat

Bill Baldwin

Patrol Boat Dispatcher

Jere Beery Sr.

Photographer

Ricou Browning

The Gill Man (In Water), Lab Technician

Diane DeLaire

Miss Abbott

Mike Doyle

Cop

Clint Eastwood

Jennings

Jack Gargan

Skipper

Charles A. Gibbs

Cop

Brett Halsey

Pete