A teenage ballerina suffers from painful migraines and muscle failures; a young missionary's skin crawls when he uncovers an unholy revelation.

A mysterious infection takes over a 7-year-old child's brain, causing violent and uncontrollable seizures.

In Illinois, a newly engaged man mysteriously collapses and faces organ failure. His fiancé gazes in horror as he must choose between life and limb.

Doctors discover a hideous infection in a teenager who survives getting sucked into a tornado.

A young Peace Corps volunteer gets her dream assignment in West Africa, only to be hindered by a deadly organism.

Doctors discover something is eating a newborn's eyes and brain.

Young girl develops headaches, nausea and a bizarre rash all over her body after swimming.

Three holiday celebrations and infections; Colorado couple bring home flesh eating parasite; Virginia man's heart is being eaten; Arizona photographer has emergency surgery on Christmas Eve.

A boy suffering from an apparent flu soon develops a life-threatening condition; a former beauty queen develops an extreme case of asthma.

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.

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.

A 1-year-old child who survived a premature birth is attacked from within by an unseen enemy.

Doctors seek to uncover why an Oregon man has been suffering for two years from constant coughing and insomnia.

A California man who suddenly developed a swollen face and yellow eyes is the victim of an infection that is shutting down his organs.

An Ohio toddler stops eating and craves salt; a California business executive suffers a ruptured colon; an elderly New Mexico couple become ill during a trip to New York City.

A parasite pushes a pregnant model toward suicide; a boy on summer vacation contracts an infection that rots his flesh; a hidden killer threatens to suffocate a college freshman.

An infection eats away at a traveler's face; a man's back injury leads to life-threatening complications; a parasite attacks the brain of a promising young athlete.

A sudden infection leaves an expectant young mother in a coma; a Texas woman learns that her lungs are filled with parasitic worms.

A strange growth develops on a man's wrist; a nurse finds twig-like pieces in her urine; a pregnant woman falls ill with flu-like symptoms.

After a man hits his head, he's left fighting a one-on-a-million medical mystery; a boy's wounded knee becomes home to an uninvited guest; a man unwittingly feeds his own intended killer.

A dangerous parasite strikes a woman down; an infant suffers a mysterious illness; a fungus brings a man to the brink of death.

Jeremy Wade is not a fisherman; he's an "extreme angler" in search of the biggest and most dangerous freshwater fish, the kind with a taste for human flesh. This action-adventure series also features Wade illustrating how these river monsters are constructed to kill.

Eagle-eyed technical experts prove there is no such thing as a perfect crime as they assemble the pieces every criminal leaves behind. Dramatic crime re-creations and, sometimes, part of the investigations are a staple of the series. Some of the re-creations include alternate versions of the crimes, which are disproved by science. The show's episodes follow each case from the initial investigation until it reaches its legal resolution.

Evidence suggests that species thought to be extinct are still very much alive, and wildlife biologist Forrest Galante ventures from the Florida Everglades to remote jungles in a search for the truth. Galante explores actual stories behind these creatures' purported demise and, using evidence like eyewitness accounts and last known photos, tries to prove their existence so he can protect them and help them thrive again. In Zanzibar, Forrest reveals species that have never before been filmed and captures evidence that leads to an unforgettable conclusion. Elsewhere, the investigation takes him to Taiwan for the Formosan clouded leopard, the frozen tundra of Newfoundland for the Newfoundland white wolf, and to the island of Madagascar to look for any trace of the giant Pachylemur.

Believe it or not, many women get all the way to the moment of childbirth without knowing they were pregnant. How is that possible? Using true stories as a guide, this series examines some of the reasons, which include a small or inactive fetus, dieting, irregular periods caused by stress, past infertility and poor use of birth control.

"Naked Science" strips away the layers of a scientific investigation into one of the big mysteries of our time, revealing through expert analysis realistic scenarios that either confirm or deny long-held assumptions and misconceptions.

"The Unexplained Files" investigates actual, inexplicable occurrences that have confounded scientists and inspired legends, from mysterious disappearances and UFO encounters, to unidentified fanged predators and reported curses. Besides never-before-seen footage, the series features scientists, government officials, journalists and eyewitnesses sharing vivid accounts of truly bewildering experiences. Episodes include investigations of bizarre creatures that prey on livestock in Texas, a centuries-old tome -- the Voynich Manuscript -- written in an unknown language, and Frederick Valentich, a pilot on a training flight who reported a strange craft hovering above him just minutes before he disappeared.

BD Wong is not a doctor, although he played one on TV -- forensic psychiatrist/criminal profiler Dr. George Huang on "Law and Order: SVU." So he's familiar with complicated cases and digging deep for proper diagnoses, both of which play into his role as host of "Something's Killing Me." The HLN original production is a six-part documentary series that examines puzzling diseases and symptoms that result in near-death struggles. Featuring re-enactments, each hourlong episode tells actual stories of how doctors, scientists and, in some cases, federal investigators race against time to discover what or who is killing a patient. Included are interviews with victims, their families and doctors.