Steve takes a look at the serious problem of the introduction of non-native species to Australia. The new species can crowd out the native animals. In Australia, the vast majority of animals are endemic to the continent. Steve also shows a roundup of wild camels.

Steve continues his examination of non-indigenous animal species that threaten to crowd out native Australian animals.

Beautiful scenery and adventure are encountered during Steve and Terri's visit to the isolated inhabitants of the world's largest sand island.

Green and loggerhead sea turtles lay their eggs on the land. The hatchlings face enormous obstacles to get to the ocean. Steve films the struggle and shows an annual scientific survey of the turtles off the east coast of Australia.

Steve and Terri seek the Tasmanian tiger, thought to be extinct since the 1930s, as well as Tasmanian devils, copperhead snakes, black-faced shags, pademelon joeys and wombats.

Steve and Terri travel west in search of a mate for the Goanna lizards at the reptile park. Also: the pair rappel into a deep bush gorge, but have difficulty trying to get out.

Steve gives viewers a look at freshwater crocodiles.

Steve studies some of the more placid and harmless sharks living in the waters around Australia.