- Juan Piquer Simón(as J. Piquer Simon)
- Carlos Puertoscreenplay (as Charles Puerto) &
- Juan Piquer Simónscreenplay (as Juan Piquer, John Piquer) &
- John Melsonscreenplay
- Jules Vernenovel "Voyage au centre de la Terre" (as Julio Verne)
- José María Caffarel(as Jose Mª Caffarel)
- Fabián Conde(as Fabian Conde)
- Ángel Álvarez(as Angel Alvarez)
- Ángel Menéndez(as Angel Menendez)
- Javier de Rivera(as Javier Rivera)
Rest of cast listed alphabetically
- Juan José García Caffimusic (as J.G. Caffi)
- Juan Carlos Calderón(uncredited)
- Andrés Berenguerdirector of photography (as Andres Berenguer, Andrew Berenguer)
- Derek Parsons(as Derek Parson, Dereck Parson)
- María Luisa Soriano(as Maruja Soriano, M. Soriano)
- Francisco Prósper(as Francisco Prosper)
- Emilio Ruiz del Río(as Emilio Ruiz)
- Gumersindo Andrés(as Gumer Andres)
- José Luis Camposmakeup department head (as J.L. Campos)
- Marita Sánchezhair stylist
- Francisco Arizaproduction manager (as Frank Ariza)
- Rodolfo Medinaassistant director
- Gumersindo Andrésambiance designer (as Gumer Andres)
- Salvador Debonsculptor
- Julian Garciapainter
- Modesto Gonzalezsculptor
- Vicente Jesússculptor
- Vicente Lunasculptor
- Julián Martínpainter (uncredited)
- Jacinto Soriaplasterer (uncredited)
- Salvador Ariassound director
- Rogelio Armadaon-set sound director
- Luis Castrosound effects
- Francisco Peramossound engineer
- Juan Antonio Balandínspecial effects supervisor (as J.A. Balandin)
- Jack Elkoubioptical effects
- Francisco Próspervisual effects (as Francisco Prosper)
- Emilio Ruiz del Ríovisual effects (as Emilio Ruiz)
- Fernando Espigasecond operator
- Joaquín Frutosstill photographer
- José Antonio Martínassistant camera (as J.A. Martin)
- Alfonso Sáizkey grip (as Alfonso Sainz)
- Humberto Cornejocostumes
- Carmen Zorrillaseamstress
- Angel Espinassistant editor
- Miguel Gonzalezassistant editor
- Eva Del Castilloscript girl
- Andrés Santanaproduction assistant (as Andres Santana)
- Victoriano De La Torreaccounting manager
- Félix Acasovoice dubbing: Emiliano Redondo (uncredited)
- Manuel Canovoice dubbing: Jack Taylor as Olsen (uncredited)
- Javier Dotúvoice dubbing: Pep Munné (uncredited)
- Mari Ángeles Herranzvoice dubbing: Lone Fleming (uncredited)
- Teófilo Martínezvoice dubbing: Jack Taylor as the Mysterious Elder (uncredited)
- Carlos Revillavoice dubbing: Frank Braña (uncredited)
- Francisco Sánchezvoice dubbing: Kenneth More (uncredited)
- Joaquín Vidrialesvoice dubbing: Manuel Pereiro (uncredited)
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