A criminal hijacks the Mach Five during the Monte Carlo Rally. Speed later identifies the man, who is a famous gambler, Mr. Fastbucks, but can't prove it. When he confronts Mr. Fastbucks, Speed is told his master plan: Mr. Fastbucks has bought up coal and train companies and by blowing up the world's gas supplies, he will become fabulously rich. Instead it is Mr. Fastbucks who gets blown up.