Trivia

This had very limited cinema release in the UK under the title "Vengeance". It had to wait almost 50 years to get shown on British television, where it has always been shown under the title "The Brain".

The third film version in less than twenty years of the famous science-fiction novel "Donovan's Brain", by Curt Siodmak. Some indication of how loose an adaptation it is can be given by the fact that there is no mention anywhere in it of anyone called Donovan. Curt SiodmaK was displeased by all three of the film versions.

In his memoirs, Freddie Francis says that Peter van Eyck did not get on with Anne Heywood at all.

The first of the several films producer Raymond Stross made with his wife Anne Heywood - she was in all but one of his subsequent films.

Leading lady Anne Heywood was married to the film's producer, Raymond Stross.