Colonel Straub, a military intelligence officer recruits ""Captain Sharp"" as a scout, searching for a suspected chemical weapons factory operated by Brock Vanleer, a rogue Army major and chemical warfare specialist. The secret militia base is near the course of an Unlimited Series off-road race, and Flyer's cover as a driver protects him when he's captured by Vanleer. But the sinister financial backer bankrolling the chemical weapons, who turns out to be Garner Rexton, wants Flyer eliminated. Flyer is saved when the other Fastex drivers arrive and help him take on the heavily armed militia, using their race cars to battle tanks and helicopters. But all traces of the chemicals are destroyed, and with them any chance for Flyer to determine if a similar chemical nerve agent caused his on-going panic attacks.