Filmography
| Role | Title | Year | Character |
|---|---|---|---|
| Writer | El cuervo | 1994 | |
| Writer | Juez Dredd | 1995 | |
| Writer | RoboCop 2 | 1990 | |
| Writer | Juegos de guerra | 1983 | |
| Writer | Eraser (Eliminador) | 1996 | |
| Writer | Eraser (Eliminador) | 1996 | |
| Writer | Grupo salvaje | 1969 | |
| Writer | Grupo salvaje | 1969 | |
| Producer | En el corazón de la jungla | 1993 | |
| Writer | Carga maldita | 1977 | |
| Writer | La frontera | 1982 | |
| Writer | Guerreros del sol | 1986 | |
| Writer | Morituri | 1965 | |
| Writer | The Hi-Lo Country | 1998 | |
| Writer | El mayor robo del siglo | 1978 | |
| Writer | L.A. Confidential | 2003 | |
| Writer | Strange New World | 1975 | |
| Writer | Sin Advertencia (Without Warning) | 1994 |