Season 4 Episodes8
Cast1

Jeremy Wade
Self - Presenter
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Ranked #7 of 8 in Season 4•−0.3 vs season avg
It's common knowledge that crocodiles and hippos are deadly predators in Zambian waterways, but it seems there's another monstrous beast stalking the treacherous Zambezi River. The locals call this river monster "the Mazunda" but Jeremy Wade is unfamiliar with any fish by that name. Will

Jeremy Wade
Self - Presenter
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"Invisible Executioner" is episode 3 of River Monsters season 4. It scored 8.1/10 from 69 votes, ranking #7 of 8 episodes this season (season average 8.4). It aired on April 15, 2012.