Alfonso, Eduardo and Cristina get lost when visiting a forest. A strange monk finds them and takes them to an ancient convent. There, the three amigos suffer personality changes, specially Cristina who tries to seduce Alfonso in a strange coincidence to a story told by an old monk. After some efforts to escape, Alfonso is trapped inside a jail and more strange and macabre situations happen.
You can now watch The Phantom of the Monastery online on the following streaming providers in the United States.
| Directing | Fernando de Fuentes | Director |
| Directing | Paul Castelain | Assistant Director |
| Sound | Joselito Rodríguez | Sound |
| Writing | Jorge Pezet | Writer |
| Art | Fernando A. Rivero | Art Direction |
| Camera | Ross Fisher | Director of Photography |
| Writing | Fernando de Fuentes | Writer |
| Production | Jorge Pezet | Producer |
| Sound | Roberto Rodríguez | Sound |
| Editing | Fernando de Fuentes | Editor |
| Writing | Juan Bustillo Oro | Writer |
| Camera | Agustín Jiménez | Still Photographer |
| Sound | Max Urban | Music |
