John Sherwood Director Jeff Morrow Dr. William Barton Actor Rex Reason Dr. Thomas Morgan Actor Leigh Snowden Marcia Barton Actor Gregg Palmer Jed Grant Actor Maurice Manson Dr. Borg Actor James Rawley Dr. Johnson Actor David McMahon Capt. Stanley Actor Paul Fierro Morteno Actor Lillian Molieri Mrs. Morteno Actor Larry Hudson State Trooper Actor Frank Chase Steward Actor Ricou Browning The Gill Man Actor William Alland Producer Arthur A. Ross Screenwriter Maury Gertsman Cinematographer Edward Curtiss Film Editing Alexander Golitzen Art Director Robert Emmet Smith Art Director John P. Austin Set Decoration Russell A. Gausman Set Decoration