An invisible attacker ravages a 4th grade teacher from the inside out. A ticking time bomb threatens to end a young dancer's career.

A nine year old hockey prodigy is attacked by a brain eating monster and brought to the brink of death. A computer programmer from Virginia loses control of his mind when his body is invaded by the deadliest parasite on earth.

A three year old begins having extreme bouts of vomiting and diarrhea, her parents think she just has a stomach flu. But when she loses a third of her body weight in only a few days, they are left desperate and helpless.

An Iraq war veteran wakes in the middle of the night with an uncontrollable urge to relieve himself, and he heads for the bathroom. The foot-long worm he pulls from inside him will change his life forever.

An 8 year old girl begins having daily stomach cramps, when the stomach pains become unbearable, a stool sample reveals that she's become a living refuge for a host of some of some of the most common parasites in nature.

After a biopsy of her intestine, doctors find thousands of silent monsters living in a mother's tissue, but she's never left the country. Three stories of parasitic infection with one thing in common. They're all native to America!