Chaco, a Mexican on the run from just about everyone, is framed for the killing of a couple of Mexican cattlemen. Everyone knows he's innocent but the evidence is substantial. Chaco escapes and with the help of a bounty hunter, goes after the real murderers.

The bandit Pratt, looking for Tim, who is responsible for the death of his two sons, attacks a caravan killing all the passengers. Harry, the vagabond, after having robbed the dead, casually meets Tim and they become friends. Running away together from Pratt, they reach Harry's farm, but their hiding place is soon discovered.

Starblack is a hero who dresses in black and his face is covered by a black scarf and he carries in his shirt a black star, which he always leaves at the scene of his enterprises, as a symbol of justice.