In Madrid, Spain, at the end of the 19th century, the young and reckless Basilio seems to be the only person who perceives the spectral presence of Professor Robinsón de Mantua, who begs him to take care of his niece Inés, because she is in grave danger.
| Actor | Role |
|---|---|
 Antonio CasalBasilio Beltrán | Basilio Beltrán |
 Isabel de PomésInés | Inés |
 Guillermo MarínDoctor Sabatino | Doctor Sabatino |
 Félix de PomésProfessor Robinsón de Mantua | Professor Robinsón de Mantua |
 Julia LajosLa Bella Medusa's Mother | La Bella Medusa's Mother |
 Manolita MoránLa Bella Medusa | La Bella Medusa |
 Julia PacheloBraulia | Braulia |
 Antonio RiquelmeDon Zacarías | Don Zacarías |
| MManuel MirandaNot listed | Not listed |
| EEmilio BartaNot listed | Not listed |
| AAntonio L. EstradaNot listed | Not listed |
| LLuis BallesterNot listed | Not listed |
| LLuis LatorreNot listed | Not listed |
 Rosario RoyoNot listed | Not listed |
| JJulia GarcíaNot listed | Not listed |
 José FrancoNapoleon (uncredited) | Napoleon (uncredited) |