Atomic fear is the name of the game in this one, as mud that hungers for that sweet sweet radiation crawls across the scottish highlands, leading us to the special (erotic?) relationship between England and America, what damage one could potentially do with a blowtorch, thermonuclear fallout at castle bravo, and the use of minatures. 
TW: Guns, Child Death, Radiation Poisoning
Next Week is The Slime People (1963)