[1] A group of people enter an old castle where they come across an old man (Christopher Lee) who turns out to be the Devil.

[1] Katarsis was shot at Odescalchi Castle in Bracciano and Montelibretti and Olympia Studios in Romebetween 14 May and 7 June 1963.

[1] Shortly after it received its distribution visa, its production company I Della Films filed for bankruptcy.

[1] Katarsis was then purchased by Eco Films and re-released in a re-edited version, Sfida al diavolo, in 1965.

[3] Roberto Curti, author of Italian Gothic Horror Films, 1957-1969 described the director's work ranging between "naive and terrible".