Episode 1
Thailand's giant stingrays and the whip rays of Australia can grow up to 16 feet and 1,300 lbs.
Episode 2
Wolf fish, known locally as haimara, can reach a metre in length and is said to hunt humans.
Episode 3
There's a freshwater fish with a shock five times more powerful than a US wall socket.
Episode 4
The Thai snakehead is said to be able to move on land, and has apparently spread to US waters.
Episode 5
In Nicaragua, Zeb faces his most difficult battle hunting for one of the biggest monsters.
Episode 6
Some shark species can survive in freshwater as well as salt.
