Steve Backshall and his crew travel to Australia and New Zealand in search of more lethal predators. First up, Steve has his most dramatic encounter ever as he dangles beneath a helicopter and is dropped onto the nest of a wild saltwater crocodile. Steve then heads into the blistering sun of the outback to fulfil a lifelong dream of finding the most venomous snake in the world, the fierce snake whose toxic strike has the potential to kill the whole crew. Then it is time for the team to head over to New Zealand and venture deep into the Waitomo caves, where he hopes to find an unusual predator that lures insects to their death with a lethal light show. Finally, Steve heads out in search of the largest-toothed predator on the planet - the mighty sperm whale.