Conrado San Martín ( Conrado San Martín )

Inspector Tanner

Diana Lorys ( Diana Lorys )

Wanda Bronsky / Melissa

Howard Vernon ( Howard Vernon )

Dr. Orloff

Perla Cristal ( Perla Cristal )

Arne

María Silva ( María Silva )

Dany (as Mary Silvers)

Ricardo Valle ( Ricardo Valle )

Morpho Lodner

Mara Laso ( Mara Laso )

Irma Gold

Venancio Muro ( Venancio Muro )

Jean Rousseau 'Jeannot'

Félix Dafauce ( Félix Dafauce )

Chief Inspector

Faustino Cornejo ( Faustino Cornejo )

Raymond

Manuel Vázquez ( Manuel Vázquez )

Klein

Juan Antonio Riquelme ( Juan Antonio Riquelme )

Fernando Montes ( Fernando Montes )

Malou (as Fernando C. Montes)

Elena María Tejeiro ( Elena María Tejeiro )

Ursula Camila

Javier de Rivera ( Javier de Rivera )

Ángel Calero ( Ángel Calero )

Sandalio Hernández ( Sandalio Hernández )

Fernando Sala ( Fernando Sala )

María de la Riva ( María de la Riva )

(as Mª de la Riva)

Laly Vicent ( Laly Vicent )

José Carlos Arévalo ( José Carlos Arévalo )

Enrique Ferpi ( Enrique Ferpi )

Rafael Ibáñez ( Rafael Ibáñez )

Carmen Porcel ( Carmen Porcel )

Madame Gold

Rafael Hernández ( Rafael Hernández )

Marisa Paredes ( Marisa Paredes )

Luis Rico ( Luis Rico )

Juan García Tiendra ( Juan García Tiendra )

False Suspect

Amy Márquez ( Amy Márquez )

Antonio Ramos ( Antonio Ramos )

Luis Domínguez Luna ( Luis Domínguez Luna )

María del Carmen Ruiz ( María del Carmen Ruiz )

(as Mari Carmen Ruiz)

Pedro José Mariña ( Pedro José Mariña )

Pilar Gómez Ferrer ( Pilar Gómez Ferrer )

Wanda's Dresser

Tito García ( Tito García )

Mercedes Manero ( Mercedes Manero )

(as Mercedes Manera)

Antonio Ramos ( Antonio Ramos )

Juan Antonio Arévalo ( Juan Antonio Arévalo )

(as Juan Antº Arévalo)

Jesús Franco ( Jesús Franco )

Pianist (uncredited)