An escaped mental patient poses as retired dentist Dr. Caine in Paradise town. His new life seems perfect until jealousy over his landlord Jamie triggers his murderous urges, just as figures from his past arrive.

A wealthy Los Angeles teen and her superficial friends wants to break out of suburbia and experience Southern California's "gangsta" lifestyle. But problems arise when the preppies get in over their heads and provoke the wrath of a violent Latino gang. Suddenly, their role-playing seems a little too real.

A pierced and tattooed sadist, Captain Howdy, trolls the Internet for naive teens, luring them to his home to torture and defile them. When Howdy kidnaps and tortures the daughter of police Detective Mike Gage, he is caught. Deemed insane, he is sent to an asylum but is released soon after, seemingly better. However, Gage knows it is only a matter of time before Howdy strikes again, and he's ready to unleash his own form of retribution when the time comes.

Dr. Caine, the murdering dentist from the original movie, has escaped from the mental hospital where he has been since being caught. Hoping to resume a normal life, he makes his way to a quiet Midwestern town under a false name and takes on the responsibilities of the town dentist Things are starting to look up for Caine, until the day when he catches his new love in the arms of someone else. Just as in the first movie, this sends him back over the edge and into another homicidal rampage, with his unfortunate patients bearing the brunt of his hostility.

Two affluent suburban girls clash with the Latino gang culture of East Los Angeles.

A "highly sophisticated computer system" at a nuclear power plant goes crazy. To make matters worse, it develops a capacity for reason and malice while a tropical island storm is blowing into town.