Steve heads into the outback to find the world's most venomous snake, then to Tasmania to meet the Tasmanian Devil, and finally goes in search of a toxic terror living right in the heart of Sydney, the blue-ringed octopus.
Steve begins his search for the world's deadliest animals in South Africa where he has a terrifying encounter with a hippopotamus, finds a surprisingly docile spider and declares Africa's deadliest species of snake.
Continuing his search in South Africa's Kruger National Park, Steve watches a fish eagle catch it's prey, tests the strength of a spider's web and shows just how hard it is for Africa's big cats to stalk their prey by trying it himself.
Steve concludes his South African adventure in the Cape where he's chased by a honey badger, mauled by a caracal at a wildlife sanctuary and swims with docile stingrays, an animal with a bad reputation after the death of Steve Irwin.
In Queensland Steve finds an invasive cane toad and meets a victim of a tick bite at a veterinary clinic before heading into the forest in search of deadly reptiles and the notorious black widow or redback spider.
Steve heads to Australia where he's joined by Aussie herpetologist Mitch to look for a tiger snake in Perth's parks and backyards. Off the coast, the team encounter sea lions, pelicans and dolphins.