Night of the Big Heat is a 1967 British science fiction film directed by Terence Fisher, and starring Patrick Allen, Christopher Lee, Peter Cushing and Jane Merrow.

Not helping matters is the fact that despite it being the middle of winter, Fara is experiencing a stifling and inexplicable heat wave, with temperatures rising rapidly.

Hanson examines the dead sheep and finds their corpses are badly burned, whilst Swan regular Bob Hayward is attacked by something on the road while driving into the village.

Meanwhile, pub regular Tinker, losing his mind because of the heat, attempts to attack Angela whilst she's working, but when she hits him over the head with an ashtray, he flees and ends up burned to death as well.

At the weather station, he learns from meteorologist Ken Stanley and his colleague Foster that the aliens have already destroyed all their communications equipment, making it impossible to call for help.

[3] The Monthly Film Bulletin wrote: "John Lymington's novels are among the most cinematic of science fiction works, but Night of the Big Heat is not one of his best, and here it is given very conventional treatment.

Terence Fisher's direction relies largely on the contrast between the false security of the hotel and the island settings and the alien menace lurking in the wings.

But though the appearance of the invaders is effectively deferred until the final sequence, the plot is so cluttered up with irrelevancies (like the writer and his mistress from the past) that the atmosphere created by the unseen threat is very soon dissipated.