Characters played by Boris Karloff
Matthias Morteval
Characters played by Julissa
Lucy Durant
Characters played by Andrés García
Charles Beasler
Characters played by José Ángel Espinosa 'Ferrusquilla'
Ivor Morteval
Characters played by Beatriz Baz
Cordelia Rash
Characters played by Quintín Bulnes
Dr. Emerick Horvath
Characters played by Manuel Alvarado
Morgenstern Morteval
Characters played by Carmen Velez
[no data]
Characters played by Arturo Fernández
Professor Frank
Characters played by Felipe de Flores
[no data]
Characters played by Fernando Saucedo
[no data]
Characters played by Estuardo Mora
[no data]
Characters played by José Luis García de León
(as José Luis G. de León)
Characters played by Víctor Jordán
(as Victor Jordan)
Characters played by José Antonio Garcia
[no data]