Perennially undervalued, Hammer's take on Robert Louis Stevenson's oft-filmed tale of dual personalities is one of the novel's most unique cinematic adaptations, turning down the horror elements to present a startlingly frank and adult interpretation, concentrating on themes of addiction, sexual transgression, and liberation. Renowned American actor Paul Massie is perfect as the repressed and unattractive Jekyll, transforming into the dashing and libidinous Hyde - with a superb supporting cast headed by Christopher Lee and Dawn Addams, a `perfect wife' by day and `perfect mistress' by night.