A baby falls mysteriously ill and struggles to breathe. A man has something living in an embarrassing place. Plus a woman's weight gain confounds experts. S7/Ep1
A baby girl writhes in pain on the verge of death, a neuro-psychiatrist suffers multi-organ failure, and a woman suffers a baffling brain infection. S6/Ep10
One affliction shuts down a teen's lungs, another attacks the nervous system of a personal trainer, and a third infection eats the blood of a health worker. S6/Ep8
An infection may rob a college student of her eyeball, a mysterious infection paralyzes six-month old boy and a mother endures horror after birth. S6/Ep7
When three unsuspecting young families are thrown into a tailspin, they are shocked to learn of the tiny culprits wreaking havoc on their lives. S5/Ep2
A man falls comatose. A student's sore throat turns deadly, and the monster destroying him is shockingly common. A woman's bizarre symptoms stun experts. S8/Ep5
A boy is struck with a serious fever. A woman has bizarre symptoms that push her to the brink of madness, and a toddler falls into a trance-like state. S8/Ep4
A man experiences bizarre swelling around his eye. A 12-year-old girl falls mysteriously ill and a young woman's symptoms leave her close to madness. S8/Ep1
Three lively people suddenly come face to face with their own mortality. In Virginia, a teen suffers seizures and sudden blindness when her brain is attacked. S5/Ep10
Three healthy people with a love of the outdoors are struck down by a menace that lurks inside them. In Ohio, a young boy wastes away in front of his parents. S5/Ep9
Trouble is lurking in the bodies of three different women. In rural Washington State, a teenager's shoulder pain leads to her to quarantine in a matter of days. S5/Ep8
In Tennessee, new parents are horrified when a deadly infection pushes their baby daughter to the brink of death. Can she be pulled back by doctors? S5/Ep7
A contractor suffers a bump on his head while he is working, but days later, he finds himself in the ICU fighting for his life with something in his brain. S5/Ep5
Three victims each receive a monstrous Christmas present, including a woman who feels a stabbing pain in her eye and apparently sees worm's shadows. S5/Ep4
When three unsuspecting young families are thrown into a tailspin, they are shocked to learn of the tiny culprits wreaking havoc on their lives. S5/Ep2
A Massachusetts EMT is shattered by a routine emergency call when she discovers that the victim is her son, and a tough guy is brought to his knees. S5/Ep3
A Christmas baby is born, but doctors find her brain was infected in utero. A woman thinks a worm is in her eye, and a man gets a nasty surprise after surgery. S7/Ep7
When three unsuspecting young families are thrown into a tailspin, they are shocked to learn of the tiny culprits wreaking havoc on their lives. S5/Ep2
A Christmas baby is born, but doctors find her brain was infected in utero. A woman thinks a worm is in her eye, and a man gets a nasty surprise after surgery. S7/Ep7
A Christmas baby is born, but doctors find her brain was infected in utero. A woman thinks a worm is in her eye, and a man gets a nasty surprise after surgery. S7/Ep7
Three women living in vastly different locales have one thing in common: they've become unwitting hosts to baffling and deadly terrors inside them. S5/Ep1
Three victims each receive a monstrous Christmas present, including a woman who feels a stabbing pain in her eye and apparently sees worm's shadows. S5/Ep4
A man develops a strange growth on his wrist. A nurse sees twig-like pieces in her urine. A pregnant woman falls dangerously ill with flu-like symptoms. S8/Ep12
Three victims each receive a monstrous Christmas present, including a woman who feels a stabbing pain in her eye and apparently sees worm's shadows. S5/Ep4
Three victims each receive a monstrous Christmas present, including a woman who feels a stabbing pain in her eye and apparently sees worm's shadows. S5/Ep4
A man bangs his head and fights a rare medical mystery. A wound in a boy's knee hosts an uninvited guest, and a man unwittingly feeds his own killer. S8/Ep10
An infant is suddenly paralysed. A young father grapples with a monster that threatens to blind him. Plus, a woman's excruciating pain confounds experts. S8/Ep9
A teenager develops mysterious blotchy sores. A tough athlete is hit by a rare disease that make him hallucinate. Plus, a woman battles strange bouts of vomiting. S8/Ep7
An infant suffers terrifying seizures. A biology professor in a strange experiment becomes an unexpected host. A family man is hit by thousands of parasites. S8/Ep6
A man falls comatose. A student's sore throat turns deadly, and the monster destroying him is shockingly common. A woman's bizarre symptoms stun experts. S8/Ep5
A man develops a strange growth on his wrist. A nurse sees twig-like pieces in her urine. A pregnant woman falls dangerously ill with flu-like symptoms. S8/Ep12
A boy is struck with a serious fever. A woman has bizarre symptoms that push her to the brink of madness, and a toddler falls into a trance-like state. S8/Ep4
A man develops a strange growth on his wrist. A nurse sees twig-like pieces in her urine. A pregnant woman falls dangerously ill with flu-like symptoms. S8/Ep12
A man develops a strange growth on his wrist. A nurse sees twig-like pieces in her urine. A pregnant woman falls dangerously ill with flu-like symptoms. S8/Ep12
A woman who recently gave birth is in a critical condition. A young man feels excruciating pain and doctors discover something has invaded his brain. S8/Ep3
An infant is suddenly paralysed. A young father grapples with a monster that threatens to blind him. Plus, a woman's excruciating pain confounds experts. S8/Ep9
A Christmas baby is born, but doctors find her brain was infected in utero. A woman thinks a worm is in her eye, and a man gets a nasty surprise after surgery. S7/Ep7
A teenager develops mysterious blotchy sores. A tough athlete is hit by a rare disease that make him hallucinate. Plus, a woman battles strange bouts of vomiting. S8/Ep7