Experiments with magnetism in a laboratory in south England causes a rupture in the ionosphere that leads to people going insane and insects growing large. The film starts slowly but builds up to a action packed ending. There is a lot of talk before the army starts taking out the over developed bugs and various characters are menaced. At one point a teacher is trapped in a school by some giant insects and it is quite creepy. Not a classic but well made on it's small budget.
Forrest Tucker and Gaby André (dubbed into English) as the main leads are bland but Alec Mango as Dr. Laird and Martin Benson as the mysterious Mr. Smith are good. The great Dandy Nichols makes a couple of comic appearances in a pub. Also in the cast are the reliable Hugh Latimer, Geoffrey Chater, Peter Copley and Howard Pays.
It has the plot point of the male scientists not wanting to have a female scientist forced on their team, which is so old a trope that it has whiskers. Of course the female turns out to be capable and attractive (and French!) and the men soon melt.
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