Italian filmmaker Ovidio Assonitis, who had ripped off The Exorcist with his successful Chi Sei? (1974) here turns his attentions to the post-Jaws ecokill film with silly results. The titular beast kills swimmers and divers before attacking a sailing regatta (an idea which, paradoxically, was re-appropriated for the American Jaws 2). The film's most outstanding feature is its cast, which includes John Huston, Shelley Winters, and a phoned cameo by Henry Fonda. Bo Hopkins and Claude Akins are also along for the minimal excitement.
by Robert Firsching synopsis