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‘River Monsters’ Hunts Down the Fish That’s Been Stabbing Tourists (Exclusive Video)

New episode airs Sunday at 9 p.m. on Animal Planet

Jeremy Wade investigates “the case of the stabbed snorkeler” in a preview of Sunday’s episode of Animal Planet’s “River Monsters.”

In the episode, Wade travels to Sulawesi, Indonesia, where a snorkeler has been impaled and killed by an unseen underwater assailant in front of a packed tourist beach, the latest in a spate of similar attacks across the region.

In the clip, Wade travels out in a canoe with local fisherman, catching a brief glimpse of the fish that has been leaping from the water and spearing fishermen and tourists at random, causing injury paralysis and death.

The episode, titled “Coral Reef Killer,” comes amid “River Monsters'” final season. The network announced back in March that the currently airing six-episode season would be the show’s last. Read full descriptions of each episode below:

“Ice Cold Killer”: Travelling from London to Greenland and on to Norway, Wade follows the trail of an unknown sea monster. Fishing through ice to extraordinary depths, he attempts to reel in this monster before the full fury of an Arctic storm hits.

“Coral Reef Killers”: On the tropical island of Sulawesi, Indonesia, a tourist snorkeler and several local fishermen have been killed and injured by a mysterious sea creature that impales its victims. Wade travels to the scene to investigate, risking life and limb to solve the mystery before anyone else falls victim.

“Return of the Killer Catfish”: On his first River Monsters investigation, Wade was propelled into a mountain river by a goonch catfish as big as himself. 10 years on, he fears such fish are now extinct until he hears a report from Nepal that sounds strangely familiar. Could the original river monster be back from the brink and back in business?

“Volcanic Island Terror”: On a volcanic Pacific island, an ancient fishing community is being terrorized by something unknown in the water that’s been leaving behind mysterious puncture wounds on its victims. Can Wade uncover the identity of this fanged assailant?

“Malaysian Lake Monster”: When two men mysteriously vanish on a remote lake in Malaysia, Wade sets out to track down the possible killer. Amid rumors of a giant fish on the loose, he follows the evidence into the last stronghold of an old adversary: the one river monster that he’s failed to catch.

“Killers from the Abyss”: Wade takes on the biggest investigation of his career; to unravel what happened to over one thousand passengers of the RMS Laconia, torpedoed in the mid-Atlantic. To discover the culprits, he travels the globe, battling extraordinary fish, massive sharks and a deep-sea monster.

“River Monsters” airs Sundays at 9 p.m. ET/PT on Animal Planet.