Part horror movie, part medical detective story, find out 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 experts who witnessed each case, leads the scientific discussion about each parasite.
| Title | Air Date | Duration | ||
|---|---|---|---|---|
| Season 1 | Episode 1 | Sleeper Cells | 2009-07-01 | 60 min |
| Season 1 | Episode 2 | Outbreak | 2009-07-08 | 60 min |
| Season 1 | Episode 3 | Sex Maniacs | 2009-07-15 | 60 min |
| Season 1 | Episode 4 | Masters of Disguise | 2009-07-22 | 60 min |
| Season 1 | Episode 5 | Hijackers | 2009-07-29 | 60 min |
| Season 1 | Episode 6 | Living with the Enemy | 2009-08-05 | 60 min |
| Season 2 | Episode 1 | Suicide Attackers | 2010-06-09 | 60 min |
| Season 2 | Episode 2 | Feeding Frenzy | 2010-06-16 | 60 min |
| Season 2 | Episode 3 | Cold Blooded Killers | 2010-06-23 | 60 min |
| Season 2 | Episode 4 | Lurkers | 2010-07-07 | 60 min |
| Season 2 | Episode 5 | Flesh Eaters | 2010-07-14 | 60 min |
| Season 2 | Episode 6 | Stowaways | 2010-07-28 | 60 min |
| Season 2 | Episode 7 | Breeders | 2010-08-04 | 60 min |
| Season 2 | Episode 8 | Double Agents | 2010-08-11 | 60 min |
| Season 2 | Episode 9 | Homegrown Enemies | 2010-08-18 | 60 min |
| Season 2 | Episode 10 | Shape Shifters | 2010-08-25 | 60 min |
| Season 3 | Episode 1 | My Child Will Only Eat Cat Food | 2012-10-05 | 60 min |
| Season 3 | Episode 2 | Something's Eating My Son Inside Out | 2012-10-12 | 60 min |
| Season 3 | Episode 3 | My Face-Eating Parasite | 2012-10-19 | 60 min |
| Season 3 | Episode 4 | My Daughter is Losing Her Mind | 2012-10-26 | 60 min |
| Season 3 | Episode 5 | Something's Eating My Dreams | 2012-11-02 | 60 min |
| Season 3 | Episode 6 | A Monster's Taking My Baby | 2012-11-09 | 60 min |
| Season 3 | Episode 7 | I Coughed Up Worms! | 2012-11-16 | 60 min |
| Season 3 | Episode 8 | My Brain Has Been Hijacked | 2012-11-23 | 60 min |
| Season 3 | Episode 9 | You Left What Inside Me? | 2012-11-30 | 60 min |
| Season 3 | Episode 10 | Killer in My Neck | 2012-12-07 | 60 min |
| Season 4 | Episode 1 | The Flesh-Eating Monster | 2013-09-30 | 60 min |
| Season 4 | Episode 2 | There's a Worm in My Eye | 2013-10-07 | 60 min |
| Season 4 | Episode 3 | Choosing Between Life and Limb | 2013-10-11 | 60 min |
| Season 4 | Episode 4 | It Came from a Tick... | 2013-10-18 | 60 min |
| Season 4 | Episode 5 | My Husband is Hallucinating | 2013-10-25 | 60 min |
| Season 4 | Episode 6 | Dying Abroad | 2013-12-11 | 60 min |
| Season 4 | Episode 7 | Maggots Are Eating Me Alive | 2013-12-11 | 60 min |
| Season 4 | Episode 8 | A Deadly Swim | 2013-12-18 | 60 min |
| Season 4 | Episode 9 | My Christmas from Hell | 2013-12-18 | 60 min |
| Season 4 | Episode 10 | I Almost Killed My Baby | 2013-12-18 | 60 min |
| Season 5 | Episode 1 | My Daughter's Going Crazy | 2014-10-09 | 60 min |
| Season 5 | Episode 2 | West Nile Attack | 2014-10-16 | 60 min |
| Season 5 | Episode 3 | A Menace in My Own Backyard | 2014-10-23 | 60 min |
| Season 5 | Episode 4 | The Killer in the Lake | 2014-11-06 | 60 min |
| Season 5 | Episode 5 | There's a Worm Crawling in My What? | 2014-11-13 | 60 min |
| Season 5 | Episode 6 | Vampire Parasites Attack | 2014-11-20 | 60 min |
| Season 5 | Episode 7 | A Holiday in the Hospital | 2014-12-04 | 60 min |
| Season 5 | Episode 8 | My Body is Rotting | 2014-12-11 | 60 min |
| Season 5 | Episode 9 | The Brain Colonizer | 2014-12-11 | 60 min |
| Season 5 | Episode 10 | I Smell Like Death | 2014-12-18 | 60 min |
| Season 6 | Episode 1 | There's Something Living in My Knee?! | 2015-10-29 | 60 min |
| Season 6 | Episode 2 | Help! My Son is a Leper | 2015-10-29 | 60 min |
| Season 6 | Episode 3 | My Vacation from Hell | 2015-11-05 | 60 min |
| Season 6 | Episode 4 | There's a Fungus in My What!?! | 2015-11-05 | 60 min |
| Season 6 | Episode 5 | Worms Are Eating My Lungs | 2015-11-12 | 60 min |
| Season 6 | Episode 6 | An Amoeba is Eating My Brain | 2015-11-19 | 60 min |
| Season 6 | Episode 7 | The Eyeball Eater | 2015-12-03 | 60 min |
| Season 6 | Episode 8 | The Backyard Killer | 2015-12-10 | 60 min |
| Season 6 | Episode 9 | All I Got for Christmas is Brain Surgery | 2015-12-17 | 60 min |
| Season 6 | Episode 10 | They Hijacked My Eyeball | 2015-12-22 | 60 min |
| Season 7 | Episode 1 | Backyard Killers | 2016-10-06 | 60 min |
| Season 7 | Episode 2 | I Have a What in My What? | 2016-10-13 | 60 min |
| Season 7 | Episode 3 | There's Something Living in My Hand! | 2016-10-20 | 60 min |
| Season 7 | Episode 4 | My Wife is Rotting | 2016-10-27 | 60 min |
| Season 7 | Episode 5 | My Hands Are Falling Off | 2016-11-03 | 60 min |
| Season 7 | Episode 6 | My Evil Twin is Driving Me Crazy | 2016-11-10 | 60 min |
| Season 7 | Episode 7 | Holiday From Hell | 2016-12-15 | 60 min |
| Season 8 | Episode 1 | Help! I'm Being Eaten Alive | 2017-10-15 | 60 min |
| Season 8 | Episode 2 | My Brain Is Under Attack | 2017-10-15 | 60 min |
| Season 8 | Episode 3 | My Second Brain Is Killing Me | 2017-10-22 | 60 min |
| Season 8 | Episode 4 | The Monster In My Mouth | 2017-10-29 | 60 min |
| Season 8 | Episode 5 | There's a Maggot in My Head | 2017-11-05 | 60 min |
| Season 8 | Episode 6 | Something Is Eating My Baby | 2017-11-12 | 60 min |
| Season 8 | Episode 7 | Braced for Death | 2017-11-19 | 60 min |
| Season 8 | Episode 8 | I Can't Stop Coughing Up Blood | 2017-11-26 | 60 min |
| Season 8 | Episode 9 | The Organ Shredder | 2017-12-03 | 60 min |
| Season 8 | Episode 10 | My Lungs Are Rotting | 2017-12-10 | 60 min |
| Season 8 | Episode 11 | All I Got for Christmas | 2017-12-17 | 60 min |
| Season 8 | Episode 12 | There Are Twigs In My Urine | 2017-12-17 | 60 min |
| Directing | Nicholas Zeig-Owens | Director |
