Season 3 - Episode Guide

A mother is left shocked when her daughter loses her appetite but then suddenly develops cravings for salt and cat food; a man suffers a damaged colon from a common bacteria; a traveling couple are left fighting an age-old killer.

A teenage boy is attacked by a disease that's causing his flesh on his face to rot; an intruder drives a model/actress to the brink of suicide; a college student finds herself struggling for every breath.

A man travels to South America with his girlfriend, but picks up a flesh-eating souvenir along the way; a man develops severe back pains before the cause is discovered; a promising athlete is sidelined by a mysterious infection.

An unusual intruder causes a newlywed woman's mental state to deteriorate; a young boy may lose his life when an infection causes his muscles to break down; an infection causes a plumber to lose 50 lbs.

A teenage girl has an intruder in her hand; a man tries desperately to eviscerate a can tab he accidentally swallowed; parasitic worms attack the brain of an otherwise healthy man.

A pregnant woman is attacked by a monster that threatens the life of her unborn baby; an elderly man has something in his lungs that stumps doctors; a truck driver is blindsided by a parasite.

A pregnant woman slips into a coma when a horrifying intruder invades her body; a woman is left in shock when she coughs up live worms; a teenage girl suffers a chain of symptoms and doctors are unable to figure what's causing them.

A baby swallows a common everyday object that burns a hole in his esophagus; a university student has a mysterious intruder in her brain; a young woman is put in a battle with a tropical disease.

A two-year-old does battle with a deadly infection; a man has surgery to remove a tumor from his back, but the doctors accidentally leave something inside him; a 7-year-old baseball star suffers horrifying seizures that leave his parents traumatized.

Doctors discover an infection that is shutting down the organs of a young man; a teenage girl searches endlessly for a diagnosis to her mysterious chronic disease; a woman is shocked to find something is inside her breasts.