In this episode, Steve goes in search of the fastest Deadly Predators on earth. Using the latest CGI, Steve high-dives off a rugged cliff in Wales next to a gannet, tests the speed and accuracy of a gannet dive in a sky-high experiment in his deadly junkyard using a crane and an old caravan, and takes to the kayak for an amazing animal encounter with thousands of wild gannets. Then it's on to the rare blue fin tuna, the UK's fastest fish and one that is making a comeback in the UK after being close to extinction. Steve heads out to the open ocean in search of these deadly predators, and along the way he meets some other fast-swimming contenders, including whales and dolphins. He also finds a bait ball of small fish that has attracted predators from all around, and volunteers to be dragged behind the boat to test the tuna's famous speed. One of the planets ultimate speedy predators is the cheetah. Steve puts the cheetah's acceleration to the test against an electric sports car, and we explore how a cheetah is supremely designed for speed and how they make phenomenal predators. We then meet the fastest animal ever to live - the peregrine falcon. They are the ultimate speedy predator, and their turbo-charged stoop leaves their prey with little chance of escape. Steve wants to put these aerial assassins to the test, and heads to the rugged Snowdonian mountains for a high-adrenaline mountain biking speed challenge where trained peregrine Rudi hunts him down.