Three deadly illnesses darken the futures of three young boys. In Illinois, a mother thinks her newborn son has something wrong with his eyes. When doctors analyze the boy further, they discover something is eating his eyes and brain.

Three women in different locales have one thing in common: they've become unwitting hosts to baffling & deadly terrors. A teenage girl thinks she's losing her mind, but she actually has a life threatening inflammation of the brain.

When three unsuspecting young families are thrown into a tailspin, they are shocked to learn of the tiny culprits wreaking havoc on their lives.

A Massachusetts EMT is shattered by a routine emergency call when she discovers that the victim is her son and a self-described tough guy in New Jersey is reduced to tears when something sinister starts to rip apart his intestines.

A contractor bumps his head while working & days later finds himself in the ICU fighting for his life. A college football player is in agony from blinding headaches, and a boy is enjoying summer when a mystery illness takes hold.

A 15-year-old girl comes down with a dangerous affliction. A traveler returns from a trip with what she thought was a simple skin irritation, but turns out to be something far worse. And a teenager is nearly choked alive by a growth.

A war veteran, a PhD scientist and a newborn are all clinging to life by a string by horrible, mysterious and deadly illnesses.

Christmas time is here, and these three victims each receive a monstrous gift. One such victim was out Christmas shopping when she suddenly felt a stabbing pain in her eye and believes she sees shadows of worms affecting her sight.

Trouble is lurking in the bodies of three different women, one of whom has shoulder pain that leads to her being quarantined in a matter of days. If doctors can't determine what's attacking her, she'll die.

Three lively people suddenly come face to face with their own mortality including a teen who suffers seizures and sudden blindness when doctors discover her brain is under attack.

Three healthy people with a love of the outdoors are struck down by a deadly menace that lurks inside them. One story involves a young boy who wastes away in front of his parents' eyes as a mysterious infection overtakes his body.

The worlds of 3 families are turned on their heads. A mysterious outbreak leads to a 4 year-old boy drowning in his own mucus. A wound in a 7 year-old's knee has a vile cause. Bizarre dreams precipitate a student's hospitalization.

The lives of three families are twisted in knots. A mysterious infection brings a tough ultra-marathoner to his knees. A teenager contracts one of the most feared diseases on the planet. And a woman's brain is practically set on fire.

The lives of three families are thrown out of whack. One infection rips a man's leg apart. A rare brain infection pushes a seven-year-old girl toward suicide. And another lands a woman in the hospital, eluding the doctors.

The lives of three families are turned upside down. A couple purchases their dream home, but it turns into a nightmare. An insidious creature takes a man's spleen. And a domestic pet takes a young boy to the edge of death.

Southern discomfort comes to 3 families in the American South. A baby nearly dies from something everyone has in their home. A man has worms crawling throughout his lungs, and a female boxer gets blindsided by a rare infection.