杰夫·莫罗

Jeff Morrow

饰：Dr. William Barton

莱克斯·瑞森

Rex Reason

饰：Dr. Thomas Morgan

Leigh Snowden

饰：Marcia Barton

格雷格·帕尔默

Gregg Palmer

饰：Jed Grant

Maurice Manson

饰：Dr. Borg

James Rawley

James Rawley

饰：Dr. Johnson

David McMahon

饰：Capt. Stanley

Paul Fierro

饰：Morteno

Lillian Molieri

饰：Mrs. Morteno

Larry Hudson

饰：State trooper

弗兰克·蔡斯

Frank Chase

饰：Steward

瑞科·布朗宁

Ricou Browning

饰：Creature (in water) (uncredited)

Don Megowan

饰：Creature (on land) (uncredited)