On Halloween night at a horror theme park, a costumed killer begins slaying innocent patrons who believe that it's all part of the festivities.

When a former CIA operative is kidnapped by a group of terrorists, his son learns there is no plan for his father to be saved—so he launches his own rescue operation.

Julian Michaels has designed the ultimate resort: VICE, where anything goes and the customers can play out their wildest fantasies with artificial inhabitants who look, think and feel like humans. When an artificial becomes self-aware and escapes, she finds herself caught in the crossfire between Julian's mercenaries and a cop who is hell-bent on shutting down Vice, and stopping the violence once and for all.

A parasitic alien soul is injected into the body of Melanie Stryder. Instead of carrying out her race's mission of taking over the Earth, "Wanda" (as she comes to be called) forms a bond with her host and sets out to aid other free humans.