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Season 8, Episode 6: Invisible Killers

Jeremy has tracked down freshwater killers for 30 years, but now he's discovered that he was sharing those waters with darker, deadlier creatures - parasites. Faced with the fact that he might be harboring his own undetected killer, Jeremy undergoes specialized tests at the world's first school of tropical medicine and embarks on one of his most disturbing missions ever as he returns to the Amazon to hunt down the victims of horrific invisible predators that could very well be living inside him.