The screen adaptation is directed by Peter Brook, and originated in his theatre production for the Royal Shakespeare Company. The English version was written by Adrian Mitchell from a translation by Geoffrey Skelton.

The cast included Ian Richardson, Patrick Magee, Glenda Jackson, Clifford Rose, and Freddie Jones. It was filmed at Pinewood Studios in Buckinghamshire and released by United Artists on 22 February 1967 in the United States, and 8 March 1967 in the United Kingdom. The film’s score comprised Richard Peaslee’s compositions. David Watkin was the cinematographer. (Wikipedia)