Raoul Duke and his attorney Dr. Gonzo drive a red convertible across the Mojave desert to Las Vegas with a suitcase full of drugs to cover a motorcycle race. As their consumption of drugs increases at an alarming rate, the stoned duo trash their hotel room and fear legal repercussions. Duke begins to drive back to L.A., but after an odd run-in with a cop, he returns to Sin City and continues his wild drug binge.

While on a stakeout, Judith Gray, a beautiful, tough cop, is trapped inside a warehouse full of toys that have been awakened to murderous life by a strange child of darkness.