| Person | Type | Job | Role(s) |
|---|---|---|---|
 Carlo Simi | Crew | Crew | In Memory Of |
 Sergio Leone | Crew | Crew | In Memory Of |
 Zeltia Montes | Crew | Sound | Original Music Composer |
Joan Martorell | Crew | Sound | Orchestrator |
Alex Alcántara | Crew | Sound | Sound Mix Technician |
Toño Cubillo | Crew | Sound | Sound Mix Technician |
Pepe Pleguezuelos | Crew | Sound | Sound Re-Recording Mixer, Sound Mixer |
 Guillermo de Oliveira | Crew | Directing | Director, Writer, Producer, Director of Photography, Editor, Camera Operator |
Leroy Kincaide | Crew | Camera | Camera Operator |
Luisa Cowell | Crew | Production | Producer |
Javier Duch | Crew | Sound | Sound, Editor, Sound Designer |
Alejandro Rochette | Crew | Sound | Sound Re-Recording Assistant, Sound Mix Technician |
Ezequiel Romero | Crew | Editing | Colorist |
Ignacio Sánchez de Bustamante | Crew | Camera | Camera Operator |
Naftali Beane Rutter | Crew | Camera | Camera Operator |
Malores Fernández de Olivera | Crew | Camera | Assistant Camera |
 Alberto Sobreviela Falces | Crew | Visual Effects | Animation |
Csaba Mészáros | Crew | Production | Associate Producer |
Alejandro F. Larrañaga | Crew | Production | Associate Producer |
Richard D. Jensen | Crew | Production | Associate Producer |
Pedro González Kuhn | Crew | Camera | Camera Operator |
 Cédric Biscay | Crew | Production | Associate Producer |
 Juls Gars | Crew | Visual Effects | Animation |
Péter Illényi | Crew | Sound | Conductor |
Iñaki Villuendas | Crew | Art | Graphic Designer |
 Carlo Leva | Cast | Actor | Self - Assistant Art Director (1966) |
 Christopher Frayling | Cast | Actor | Self - Sergio Leone's Biographer |
 Clint Eastwood | Cast | Actor | Self - Actor (1966) |
 Ennio Morricone | Cast | Actor | Self - Film Composer (1966) |
Eugenio Alabiso | Cast | Actor | Self - Film Editor (1966) |
 James Hetfield | Cast | Actor | Self - Musician |
 Joe Dante | Cast | Actor | Self - Filmmaker |
Sergio Leone | Cast | Actor | Self - Filmmaker (archive footage) |
 Sergio Salvati | Cast | Actor | Self - Assistant Camera Operator (1966) |
 Álex de la Iglesia | Cast | Actor | Self - Filmmaker |
 Devan Scott | Cast | Actor | Self - Filmmaker (archive footage) |
Will Ross | Cast | Actor | Self - Filmmaker (archive footage) |
Peter J. Hanley | Cast | Self - Biologist / Author | |
Stephen Leigh | Cast | Self - Film Critic | |
Diego Montero | Cast | Self - AC Sad Hill Member | |
Sergio García | Cast | Actor | Self - AC Sad Hill Member |
David Alba | Cast | Actor | Self - AC Sad Hill Member |
Joseba del Valle | Cast | Self - AC Sad Hill Member | |
Daniel Jeffery | Cast | Actor | Self - Film Editor (archive footage) |
| Person | Type | Job | Role(s) |
