Michael Brandon as Roberto Tobias

Mimsy Farmer as Nina Tobias

Jean-Pierre Marielle as Gianni Arrosio

Aldo Bufi Landi as Pathologist

Calisto Calisti as Carlo Marosi

Marisa Fabbri as Amelia, the Maid

Oreste Lionello as The Professor

Fabrizio Moroni as Mirko

Corrado Olmi as Porter

Stefano Satta Flores as Andrea

Laura Troschel as Maria

Francine Racette as Dalia

Bud Spencer as Diomede / Godfrey

Dante Cleri as Coffin Salesman

Guerrino Crivello as Rambaldi, the Neighbor

Gildo Di Marco as Postman

Tom Felleghy as Police Commissioner Pini

Leopoldo Migliori as Musician

Fulvio Mingozzi as Music Studio Manager

Stefano Oppedisano as Bearded guy with girlfriend

Pino Patti as Funeral Exhibition Attendant

Ada Pometti as Extra (credit only)

Jacques Stany as Psychiatrist

Fortunato Cecilia as Funeral Exhibition Visitor (uncredited)

Franz Colangeli as Funeral Exhibition Visitor (uncredited)

Shirley Corrigan as Girl at Party (uncredited)

Luigi Cozzi as Masked Killer in Theater (uncredited)

Giovanni Di Benedetto as Funeral Exhibition Attendant (uncredited)

Sandro Dori as Funeral Exhibition Attendant (uncredited)

Renzo Marignano as Funeral Exhibition Attendant (uncredited)

Quinto Marziali as Funeral Exhibition Visitor (uncredited)

Diego Morreale as Extra (uncredited)

Anna Maria Perego as Delia's Mother (uncredited)

Pupita Lea Scuderoni as Funeral Exhibition Visitor (uncredited)

Maurizio Streccioni as Funeral Exhibition Visitor (uncredited)