This spaghetti western presents a fictitious version of the often filmed legend of Pat Garrett and Billy the Kid. Billy becomes innocently an outlaw while protecting his mother, but then turns into a trigger happy killer. When he falls in love he tries with the help of Pat Garrett, a fatherly friend, to change back. However, circumstances force Billy to become violent again and it is Garrett who is credited with the killing.

Peter Lee Lawrence
as William 'Billy the Kid' Bonney

Fausto Tozzi
as Pat Garrett

Dyanik Zurakowska
as Helen Tunstill

Gloria Milland
as Mrs. Kathleen Bonney

Carlos Casaravilla
as Jackson Murphy

Antonio Pica
as Mark Travis

Luis Prendes
as John Tunstill

Enrique Ávila
as Hank - Fort Summer Saloonkeeper

Orlando Baralla
as Governor of New Mexico

Francisco Sanz
as Peddler