This is basically another film version of Robert Louis Stevenson's story `The Strange Case of Dr Jekyll and Mr Hyde' but with the main characters' names changed for no apparent reason!
Unfortunately, despite the presence of movie legends Peter Cushing and Christopher Lee, this has to rank as one of the dullest film versions of this classic tale mainly because it is just too talky and often gets bogged down with too much reference to Freud!
This film must be classed as a huge disappointment to fans of films made by Amicus Studios, who were a serious rival to Hammer Studios during this period. For a much superior film version of Jekyll and Hyde horror fans would be better off checking out Rouben Mamoulian's 1931 film version. Hammer themselves made a far more interesting version of this famous story with their 1971 film `Dr Jekyll and Sister Hyde' - after already having filmed a version back in 1960 called `The Two Faces of Dr Jekyll', a.k.a. `House of Fright', also featuring Christopher Lee.
On the plus side this is a very nice transfer in 1.78:1 wide screen ratio and there is an atmospheric music score by renowned composer and conductor Carl Davis. On the minus side there are no extras at all, except for scene selection, so this is really only an essential purchase for Peter Cushing/Christopher Lee/Amicus completists.