Premise: Part horror movie, part medical detective story, ``Monsters Inside Me'' depicts what happens when people fall prey to an infection from a parasite, those nasty microscopic creatures found in water, soil and even in the air. Victims' stories are retold, including how doctors and scientists attempt to unravel each case before it's too late. Biologist Dan Riskin, assisted by doctors and other authorities who are familiar with each story, leads the scientific discussion about the parasites.
S04, E01 (First Aired: Sep. 30, 2013)
A 7-year-old girl suffers from painful rashes and mysterious seizures; a college student learns her case of ``the flu'' is actually a flesh-eating infection.
S04, E04 (First Aired: Oct. 18, 2013)
A mother suffers with abdominal pain and nausea for four years until the true cause of her condition is discovered; a 2-year-old girl develops a mysterious lump on her neck.