 The film was an Italian-Spanish-Mexican co-production filmed in Mexico, Sardinia and Rome, Italy

Fulci had signed a two-picture contract with the producer, Giovanni Di Clemente, but after the two had some disagreements during the making of "Conquest", Fulci left immediately after shooting the film and refused to complete the contract.Di Clemente sued Fulci in court but lost, the judge opining that Fulci could not be compelled to work.