1967/23: Night of the Big Heat 1967

 Trailer:

 Watch movie:

https://youtu.be/wOVQudghGSo?si=tZYeRW-jQSXoXm-S

https://en.wikipedia.org/wiki/Night_of_the_Big_Heat_(film)

https://www.moriareviews.com/sciencefiction/night-of-the-big-heat-1967.htm 

https://infinitymagazine.co.uk/night-of-the-big-heat-1967-review-by-steve-kirkham/ 

https://www.filmsfrombeyond.com/2021/05/the-christopher-lee-sweat-thon-night-of.html