Originally Peter Cushing was offered to play Father Xavier Meldrum and at the time there were some rumours that Cushing hated the script. In 1983, when Cushing acted in Walker's final film, The House of Long Shadows, Walker learned that Cushing actually liked the script, but had other film commitments.
Shot in five weeks.
According to a book on Pete Walker by Steve Chibnall, Lee J. Cobb and Richard Greene were on the ideas list for the lead.