Very loosely based upon a story by Edgar Allen Poe, the film features a tour of a insane asylum by the notorious Dr. Tarr, where not all appears as it should be.
| Release date: | August 10, 1973 |
| Directed by: | Juan López Moctezuma |
| Rated: |  |
| Runtime: | 99 Minutes |
| Producer: | Roberto Viskin |
| Editor: | Federico Landeros |
| Music by: | Nacho Méndez |
| Cinematography: | Rafael Corkidi |
| Screenplay by: | Gabriel Weiss, Carlos Illescas, Juan López Moctezuma |
| Adapted from: | The System of Doctor Tarr and Professor Fether |