1. Giant Stingray

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. 13 July 2009. 44 min

Researcher Zeb Hogan travels to Cambodia to find and study the little-known giant stingray.

2. Sawfish

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. 19 September 2009. 44 min

Follow Dr. Zeb Hogan on his journey to find the largest freshwater fish in Australia: the freshwater sawfish.

3. Great White Sturgeon

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. 21 September 2009. 44 min

Follow Zeb Hogan as he goes in search of the biggest and oldest of North America's river monsters: the White Sturgeon.

4. Giant Stingray

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. 26 September 2009. 44 min

Follow Dr Zeb Hogan on his quest to find what could be the world's largest and most deadly freshwater fish: the giant freshwater stingray.

5. Raging Amazon

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. 28 September 2009. 44 min

Aquatic ecologist Dr. Zeb Hogan teams up with kayaking experts to discover what monster fish are lurking beneath the surface in Rio Roosevelt.

6. River Invasion

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. 3 October 2009. 44 min

They are carp from Asia which can jump 10 feet in the air at the sound of a boat motor, turning a day on the water into a boxing match.

11. Ancient Beast

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. 19 October 2009. 44 min

Dr Zeb Hogan travels to the American Midwest in search of the paddlefish, one of the largest, oldest and most bizarre -looking freshwater fish on the planet.

13. Mekong Mystery

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. 26 October 2009. 44 min

Giant freshwater fish are studied at Khone Falls on the Mekong River in Laos.

15. Catfish King

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. 2 November 2009. 44 min

Zeb Hogan travels to Spain in search of the invasive Wels catfish -- a monster fish capable of growing more than 8 feet long, eating birds, cats, and, as some legends claim -- even humans! The voracious predator is not native to the region, and biologists fear it could be destroying the local ecosystem.