Street Warriors is a gripping crime drama set in 1970s Barcelona. The story follows a gang of teenage delinquents involved in robberies, car thefts, and violence. A young boy witnesses his mother being murdered, leading him to join the gang and descend into a life of crime. The movie explores themes of street life, social commentary, and the consequences of teenage violence.

A veteran policeman named Fernando feels a lot of hatred against Ángel because the boy ran him over with a car leaving him lame. Now Fernando accuses the young crook of having participated in a robbery at a gas station in which a murder has occurred. Helped by his friends, Ángel rebuilds the facts that serve him as an alibi, but while he is in pre-trial detention in La Modelo prison (Barcelona) a terrible mutiny will take place.

While the Torete rob banks, the Heifer, another delinquent who has not noticed it, enters the same place to rob him. After failing the coup, both decide to associate.