Wildlife series. Steve and the crew are in Australia. Steve 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 could kill a quarter of a million mice in a single bite. Then the crew head to Tasmania where Steve finds a devilish mammal that will fly into a maniacal rage when competing for food, and finally he goes in search of a toxic terror living right in the heart of Sydney, diving into the harbour to hunt for the blue-ringed octopus.