Cast from One on Top of the Other

Jean Sorel

Dr. George Dumurrier

Marisa Mell

Susan Dumurrier / Monica Weston

Elsa Martinelli

Jane Bleeker

Alberto de Mendoza

Henry Dumurrier

John Ireland

Inspector Wald

Riccardo Cucciolla

Benjamin Wormser

Franco Balducci

Officer Loveday

Bill Vanders

Insurance Agent

Giuseppe Addobbati

Brent

Félix Dafauce

Royal Insurance Official

Jesús Puente

Sergeant Rodriguez

George Rigaud

Arthur Mitchell

Jean Sobieski

Larry

Faith Domergue

Marta

Lucio Fulci

Graphologist

Malisa Longo

Elizabeth O'Neill

Geoffrey Copleston

District Attorney

Raffaele Mottola

Governor

Bobby Rhodes

Prison Guard