Volcanic activity frees giant scorpions from the earth who wreak havoc in the rural countryside and eventually threaten Mexico City.

An American cowboy living in Mexico discovers his cattle is being eaten by a giant prehistoric dinosaur.

At Rio Galdez’s remote Brazilian trading post live assorted outcast Americans and Europeans, including Jerry Russell, ex-engineer who became obsessed with the Jivaro headhunters’ treasure, quit his job, and took…

In California, a Mexican-American laborer is falsely accused of shooting the racist farmer he was working for after the farmer stiffed him with a bad check.

Army Lieutenant Halliday, accused of stealing the Army payroll, pursues the real thief on a frantic chase through Mexico aided by the thief’s ex-girlfriend and is in turn being chased…