Fresh from prison, a street racer who was framed by a wealthy business associate joins a cross-country race with revenge in mind. His ex-partner, learning of the plan, places a massive bounty on his head as the race begins.

After selling his cattle in town, ranch owner Morgan unexpectedly dies, and his foreman Pike has to deliver the payroll to Sonora, despite the perilous journey during which he's followed by many shady characters who want the money.

Zane, an astronomer, discovers intelligent alien life. But the aliens are keeping a deadly secret, and will do anything to stop Zane from learning it.