When a straight-laced couple that has fun with a rowdy couple on vacation in Mexico return to the States, they discover that the crazy couple they met in Mexico followed them back home and decide to play tricks on them.
In San Francisco's Chinatown, a band of thugs kidnaps a girl for a large Chinese gang. Her half-brother gathers a team of expert fighters to get her back.
Madame Lu has created three "Death Machines," a trio of martial arts experts who have been injected with a special serum, turning them into mindless zombies, capable only of murder, at Lu's command. Tasked with eliminating her enemies, the Death Machines go on a blood-soaked rampage, killing anyone...
An undercover police officer takes on the job of a specialist driver to investigate the dodgy dealings of a known pharmaceutical company, only to be faced with a completely unexpected outcome.
