In this episode, Steve uncovers the secrets of sharks, the world's most infamous predators. He heads out into the Atlantic ocean to dive with blue sharks, a beautiful but deadly species which can travel up to 10,000km per year looking for food. He finds out how their big pectoral fins allow them to glide gracefully through the water, and how they are now threatened by overfishing for their fins. Next up, we head into the Deadly Den on a mission to find the ultimate shark's jaw. Steve has had two shark jaws made into amazing mechanical models. First is the cookie cutter, a shark that takes perfectly circular chunks of flesh out of their prey. Steve demonstrates the cookie cutter's bite using his mechanical jaw on some fruit. Next up is the bluntnose sixgill, which uses its jaws like a hacksaw. We then head outside to see the biggest shark jaws ever to have existed - the megalodon. Using the latest CGI, we see what this true monster of the deep looked like in real life. Then it's time go in search of a very special shark - the salmon shark. These predators can hunt in waters of minus two degrees, keeping themselves warm using some amazing adaptations. To investigate, Steve heads to the Extreme Environment Lab at Portsmouth Uni, where he becomes two fish - prey Steve and salmon shark Steve. They race each other in a swimming treadmill filled with cold water, but who will win, predator or prey? Finally, Steve dives into a flooded quarry to become a great hammerhead shark. These amazing animals use super-sensing electro reception to detect prey hidden on the bottom of the ocean. Steve tries his hand at this by using an underwater metal detector to find deadly treasure hidden at the bottom of the quarry.

In this episode, Steve goes in search of some of the most powerful predators on the planet. At historic Warwick Castle, we meet the stellar sea eagle, world's heaviest eagle. Our eagle Nikita is an expert at lifting fish up to one third of her body weight out of the ocean to eat. To demonstrate this amazing ability up close, Steve has one of the coolest pieces of tech in Deadly history - a time slice rig. Using this, Steve is able to analyse Nikita's predatory power from every angle. Next, Steve goes head to head with one of the strongest land predators - the bear. Bears aren't just strong, they are incredibly agile too. During the summer they have to catch and eat up to 30 whole salmon before hibernation. Steve puts this to the test by wearing a bear suit and being drenched in water - can he catch as many salmon as a hungry bear? On a mission to find the world's most powerful punch, Steve tries his hand at boxing with a fairground punching machine. He is no match for our professional boxer Isaac though, who gives Steve a few punching tips. However, when it comes to powerful punches, nothing can beat the peacock mantis shrimp. Despite being only six inches long, its punch has the same power as a bullet. We see in incredible CGI what a human-sized mantis shrimp could do to our boxing machine. Steve then reveals its secret superpower - it doesn't just hit with its punch, it also creates a shockwave of energy in the water. Steve supersizes this and blows up a fish tank full of water with some plastic explosives. Finally, Steve comes face to face with his favourite animal in the world - the wolf. At a special zoo in the UK, Steve meets a real wolf and a hybrid wolf, and puts their pack and jaw power to the test - can he win a tug of war with our wolf using a real deer's leg. We then head to the quarry, where Steve shows us how a wolf uses its powerful jaws to hang on to prey by trying his hand at a bucking bronco.