Creepy sci-fi chiller from Hammer in which a mysterious "mud monster" revived by military atomic experiments terrorizes Scotland while seeking new forms of radioactive material to consume in order to stay alive. Dean Jagger stars as Dr. Adam Royston, a scientist who may be the only one who can save the world from the ever-growing menace. Leo McKern, Anthony Newley, Edward Chapman, Jameson Clark also star. 91 min. Widescreen; Soundtrack: English; Subtitles: English.