Newlyweds Megan and Andrew have just moved into their dream home with aspirations to start a family. But soon strange events start happening. Voices and shadowy figures haunt Megan, and even Andrew, starts questioning his own sanity as their marriage is being torn apart. The visions grow increasingly real..and threatening, yet Megan is unwilling to relinquish her home. When the appearance of a mysterious priest unveils the truth behind their nightmare, Megan's reality takes a desperate turn that her haunting visions never could have predicted.

A young newlywed couple find themselves trapped in a network of underground caves. With her husband injured, the new bride is forced to find her way back to the surface in order to save his life. In the process, they discover a terrifying truth about the "underneath", they are not alone. Something evil is hunting them.

Students on summer break are exposed to a deadly virus that is spread rapidly through direct human contact. The infected become enslaved by the invading "swarm" intelligence and driven by an insatiable appetite to consume human flesh. Returning home, the students spread the infection to their fellow classmates and other unsuspecting townspeople.

Two young scientists are swept up in a government plot to suppress the truth about a biological disaster at a genetic research facility.