California, 1848. An invading army has defeated the few opposing forces and the territory has become part of the United States. Don César de Echagüe, an old gentleman, begs his son César to return from Europe, confident that he will know how to confront the oppressor.
Rangers Tex Haines and Dave Wyatt track a killer known as the Whispering Skull. In the wake of the Skull's slaughter, a band of thieves takes advantage of the fear he's brought to town.
California, 1847. The territory is about to be incorporated into the United States. Parker, the new governor, is a cruel man who believes that the time has come to get rich regardless of the means, but he will soon find a mysterious opponent driven to end his tyranny.
Brand controls the only road to the cattle market and is charging exorbitant rates. Tim and Chito rob Brand to recover only their overcharge, but accidentally end up with all of Brand's money......
The beautiful owner of a silver mine in Mexico asks an employee for help when bandits keep robbing her shipments.
Ken, sent to investigate cattle rustlers, poses as a peddler during the day but the Masked Rider at night.
A young man has been mutilated into a cyborg warrior, known as Bovine Rider, by the intergalactic alien council called FORESIGHT. FORESIGHT instruct him to battle another rider to complete his training so that they can have a warrior to control and lead Earth into their schemes. Chaos ensues as Bovine is challenged over who he is, and what he is supposed to be.
California, 1840s. Wealthy landowner César de Echagüe, secretly acting as El Coyote, the legendary masked hero, continues his fight against the injustices and abuses suffered by the Hispanic population at the hands of the US Army.
Alberto and Leonor have a son, they find out that one of the masked men who attacked them was her nephew, things get difficult for them when they find out about a testament left by her grandmother.
The story concerns a fierce struggle over water rights. Complicating the plot is the presence of a masked desperado who is systematically killing off local ranchers.