David (Bixby) is driving to New York in a second hand car that unbeknown to him, is filled with over a million dollars in mob money. Two former racing car drivers (Lyons & de Broux) now working as auto mechanics, discover the contents and devise a plan to carjack Bixby en route, steal the booty and finance their return to motorsport. Naturally not everything goes to plan as mob middle-man (O'Neill), double-crossing enforcer (Doubleday) and a hard-luck waitress (Carroll) whom David picks up for the ride, complicate matters.
Good supporting cast with Carroll's blonde mop-top hitch-hiker providing the feel-good sub-plot as she makes her way to reunite with her young daughter, while veteran Dick O'Neill is bullied and harassed by perennial movie bad-guy Frank Doubleday ("Escape from New York"), who resembles a younger, leaner Klaus Kinski - maniacal stare included. Alex "Incredible Melting Man" Rebar makes a brief, more robust appearance here, as the head thug who roughs up O'Neill.
After being repeatedly punctured by a cacti bush, Bixby undergoes his first metamorphosis, and the subsequent car-lifting climax makes for a memorable "Hulk-out" moment. Usual plot holes aside, this multi-dimensional storyline is certainly among the best of the series, with another fitting - albeit bittersweet - conclusion.