S1 E1: Colombia, South America is a perfect habitat for hippos. There's only one problem: they shouldn't be there. Four of them arrived from Africa illegally in the 1980s as pets for billionaire drug lord Pedro Escobar. The kingpin is long dead, but the hippos have multiplied, and now they're terrorizing the city at night. It's an unnatural disaster in the making: in Africa, hippos kill between 500 to 3,000 people a year. Miraculously, no one in Colombia has been killed... yet. But one thing is certain: this dangerous and evasive species has to be stopped.