A medieval alchemist (Klaus Kinski), knight (Harvey Keitel) and priest (Fernando Rey) mistake a flying-saucer alien for a dragon.
| Directing | Fernando Colomo | Director |
| Writing | Fernando Colomo | Writer |
| Writing | Andreu Martín | Writer |
| Writing | Miguel Ángel Nieto | Writer |
| Production | Fernando Colomo | Producer |
| Production | Jose Estaban Lasala | Producer |
| Editing | Miguel Ángel Santamaría | Editor |
| Art | Félix Murcia | Set Decoration |
| Costume & Make-Up | Javier Artiñano | Costume Design |
| Costume & Make-Up | José Antonio Sánchez | Makeup Artist |
| Production | Carlos Orengo | Production Manager |
| Directing | Antonio Isasi Jr. | Assistant Director |
| Sound | Ray Gillon | Dolby Consultant |
| Sound | José Vinader | Sound |
| Sound | Jim Willis | Sound Editor |
| Crew | Reyes Abades | Special Effects |
| Camera | Teresa Isasi | Still Photographer |
| Production | Angélica Huete | Production Secretary |
| Sound | José Nieto | Original Music Composer |
| Camera | José Luis Alcaine | Director of Photography |
