|Directed by||José Mojica Marins|
|Starring|| José Mojica Marins|
Oswaldo de Souza
Psychotic professor Oãxiac Odéz (José Mojica Marins) invites a rival professor and his wife to his home, then imprisons them and submits them into a series of sadistic ordeals, starvation, and displays of shocking rituals involving sadism and cannibalism, in an attempt to prove that the instinct overcomes reason and love.
- José Mojica Marins
- Osvaldo de Souza
- Nidi Reis
- Nivaldo de Lima
- Salvador do Amaral
- Kátia Dumont
- Dario Santos
- Carla Sotis
- Jean Silva (Garret)
- Laércio Laurelli (doubling as the voice of José Mojica Marins).
- Main article: Screenshot gallery: Theory
|thumb|300px|Theory in 4 video segments.|