Franco Nero as Onion Stark

Sterling Hayden as Henry 'Jack' Pullitzer

Martin Balsam as Petrus Lamb

Leo Anchóriz as Sheriff

Romano Puppo as 'Nerone' Foster

Nazzareno Zamperla as Oblò

Helmut Brasch as Deputy Sheriff

Duilio Cruciani as Cal 'Caligola' Foster

Emma Cohen as Mary Ann

Dick Butkus as Jeff

Enzo G. Castellari as Deputy Sheriff (uncredited)

David Warbeck as Villain with Sunglasses (uncredited)

Antonio Pica as Hal Foster (uncredited)

Massimo Vanni as Buck, Lamb Henchman

Fernando Castro as Dutch Foster

Wal Davis as Zeke

Dan van Husen as Deputy Zachary

Agustín Bescos as Oil Board Member (uncredited)

Xan das Bolas as Sam - Merchant (uncredited)

Charly Bravo as Judd (uncredited)

Alejandro de Enciso as John (uncredited)

Leopold Francis as Mack (uncredited)

Daniel Martín as Jim (uncredited)

George Rigaud as Terrateniente (uncredited)

Lucy Tiller as Violet (uncredited)

Mariano Vidal Molina as Owen (uncredited)

Manuel Zarzo as Jack (uncredited)