A California man investigates hookworms as a way to cure his allergies, but there is just one problem. No lab is willing to sell him any. You won't believe his radical action taken and the effect it has.

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. Hear 3 stories of parasitic infection with one thing in common. They're all native to America.

A 45-year-old factory worker begins to go blind. Doctors suspect tuberculosis, until they realize he's infected with a deadly parasitic killer. Then, a local restaurant triggers a massive outbreak involving a sinister parasite.

Three people must stand before the face of death. One is a toddler from Ohio, who stops eating and suffers bizarre salt cravings. When her parents realize she’s no longer growing, doctors are puzzled. What could be lurking inside her?

A successful model's first steps into motherhood run her straight into a web of blood, pain and sheer terror. What lurking menace could take this woman to the brink of suicide?

An adventurous traveler takes an epic six-month trip across South America but returns home with an unwanted monster... a mysterious infection that is devouring his face. Will doctors be able to identify this disfiguring monster?

A young newlywed suffers horrific seizures and inexplicable delusions that transform this perfectly healthy woman into a complete basket case. Will her doctors be able to tease out the monster hijacking her body?

In Oregon, something inexplicable is driving an auto specialist to madness. After 2 years of constant coughing & uncomfortable insomnia, he believes that death will be his only respite. Will his doctors uncover the monster inside him?

A pregnant teacher is blindsided by excruciating bouts of diarrhea, and to her horror she soon finds blood in the toilet. Can doctors find the invader, and save her baby’s life before it’s too late?

A young mother is expecting her second child when she suddenly is hit with a devastating infection that leaves her in a coma. Will she and her baby survive? A woman in Texas discovers that her lungs are filled with parasitic worms.

The Rauch family dodges a bullet when their prematurely born child Emmet survives for a year. But when he mysteriously coughs up blood, doctors are shocked to find a modern monster destroying his fragile body from within.

In Arlington, Texas, a 7-year-old budding baseball star might be playing his last game when a mysterious infection takes over his brain. Suffering violent and uncontrollable seizures, the situation leaves his parents traumatized.

A man suffers from an infection that's shutting down his organs.

A 7-year-old girl suffers from mysterious seizures and painful rashes and winds up in a deadly coma. And a yoga-loving college graduate's health spirals viciously out of control when "the flu" turns out to be a flesh-eating monster.

A teenage ballerina suffers debilitating migraines and muscle failures.

A newly engaged man is forced to choose between amputation or death.