Knives of the Avenger is 1966 Italian film directed by Mario Bava. Bava entered production when it was already falling apart and re-wrote and shot the film in six days. It was credited to fictitious director John Hold.
Knives of the Avenger was a troubled production originally directed by Leopoldo Savona. Mario Bava entered into the production to complete it, rewriting and reshooting the film and finishing the production in six days. Film historian Tim Lucas described Knives of the Avenger as a remake of the film Shane in a Viking setting.