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The sample provides important evidence that the huge Nile perch of Lake Turkana might be free of parasites.

Jakub has another Nile perch in imminent danger. Without help the fish won’t submerge or survive.

To find one of the Amazon’s most elusive river beasts, Jakub Vágner is treking deeper into the rainforest.

In British Columbia, Vágner goes head-to-head with a fish he has never faced before.

Once the white sturgeons get the bait, they can play with it for 15 minutes to half an hour.

Armed with a shotgun, Curtis delivers Jakub some alarming news.

Jakub is running out of steam. His only hope is that the fish is just as tired.

This expedition brings the Czech Republic native to a destination more foreign than any other.

Deep in the murky waters of Trinity River Jakub searches for a true “Texas titan”.

Jakub gets back to Houston to get a closer look at his river adversary. A much closer look.

Kirk’s dad joins him and Vágner and the guys have a small fishing competition.

About 90 miles from the Trinity River, Lake Sam Rayburn might hold better luck for Jakub.

Pat heads to Mongolia to test his wrestling skills and find out more about the so-called Death Worm.

Spain investigates the Gobi Desert's environment and comes up with some surprising discoveries.

Pat finds a snake that might have been mistakenly identified as a death worm.