Pollution caused by an incinerator drives people mad and turns them into maniac killers. But, instead of the victims' bodies, the three wise monkeys are found (one cannot hear, one cannot see, one cannot speak).
Flavio Bucci
as Hunchback
Ida Di Benedetto
as Mora
Alexandra Delli Colli
as Fedora
Pietro Francescato
as Grandpa
Janet Ågren
as (uncredited)
Richard Benson
as Gang chief
Roberto Berion
as
Antonio Scapinello
as
Caterina Lentini
as
Maria Gaetani
as
Daniela Appolloni
as
Olindo Lazzaro
as Alpine
