Character Name : Dr. Thomas Morgan

Original Name : Rex Reason

Gender : Male

Character Name : Dr. William Barton

Original Name : Jeff Morrow

Gender : Male

Character Name : Marcia Barton

Original Name : Leigh Snowden

Gender : Female

Character Name : Jed Grant

Original Name : Gregg Palmer

Gender : Male

Character Name : Dr. Borg

Original Name : Maurice Manson

Gender : Male

Character Name : Dr. Johnson

Original Name : James Rawley

Gender : Male

Character Name : Capt. Stanley

Original Name : David McMahon

Gender : Male

Character Name : Morteno

Original Name : Paul Fierro

Gender : Male

Character Name : Mrs. Morteno

Original Name : Lillian Molieri

Gender : Female

Character Name : Steward

Original Name : Frank Chase

Gender : Male

Character Name : State Trooper

Original Name : Larry Hudson

Gender : Male

Character Name : The Gill Man (in water)(uncredited)

Original Name : Ricou Browning

Gender : Male

Character Name : The Gill Man (on land)(uncredited)

Original Name : Don Megowan

Gender : Male

Character Name : Ranch Hand (uncredited)

Original Name : George Sowards

Gender : Male