Wildlife cameraman Gordon Buchanan searches for rare, giant otters and gets more than he bargained for when he stumbles upon a jaguar. Then, Steve Backshall sets out to explore the Kaieteur Falls.

The team pushes farther into the jungle as Dr. George McGavin finds the world's largest tarantula. Then, Steve Backshall joins Dr. Phil Willink for the first-ever fish survey of the Upper Essequibo River.

Steve Backshall reaches the summit of a mountain that's covered in carnivorous plants. Dr. George McGavin and Gordon Buchanan have a battle on their hands at the Rewa River, but they're rewarded with otters and a harpy eagle.