In this episode, Steve finds out which Deadly Predators have the best weapons on earth. Using the latest CGI, we bring the colossal squid to life, test the strength of its tentacles, and show how its mighty beak could slice through a car like butter. When it comes to weapons, snakes have some of the best on earth. Steve goes in search of the adder, the UK's only venomous snake and an endangered species. Then he sets out to blow our minds by showing us the fastest snake on earth: the diamond rattlesnake. By filming it in super-slow motion, we get to see just how impressive it is at catching prey. Then we have the crocodile, one of the planet's ultimate predators. Steve puts it to the test, but this time it's not about its phenomenal bite, it's all about its ability to hold its breath. Steve puts himself through his paces to see how he compares to a crocodile - in the battle of the breath hold, who will be crowned king? And, finally, an animal whose weapon is silent but deadly - the barn owl. They are the ultimate stealth killer, able to completely surprise their unwitting prey - but just how quiet are they? Steve heads to a sound studio to put this to the test, and the results are mind-blowing.

In the final episode, Steve looks back at his top Deadly Predators from the series and meets the ultimate predator. He reviews the biggest and best stunts from the series and reveals how the team bought a giant air vortex cannon to the Deadly junkyard to demonstrate the predatory prowess of the sperm whale.