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Rex Reason

Dr. Thomas Morgan

Jeff Morrow

Dr. William Barton

Leigh Snowden

Marcia Barton

Gregg Palmer

Jed Grant

Maurice Manson

Dr. Borg

James Rawley

Dr. Johnson

David McMahon

Capt. Stanley

Paul Fierro

Morteno

Lillian Molieri

Mrs. Morteno

Frank Chase

Steward

Larry Hudson

State Trooper

Ricou Browning

The Gill Man (in water)(uncredited)

Don Megowan

The Gill Man (on land)(uncredited)

George Sowards

Ranch Hand (uncredited)