Jack travels through Australia's Northern Territory to the front line of the battle between two different species of deadly crocodiles; Jack helps scientists catch and track the dangerous dinosaurs in the hope of maintaining the balance of nature.

Fearless wildlife zoologist Jack Randall dives head first into a marine mystery: are majestic green sea turtles adapting to the devastating conditions of Australia's dying Great Barrier Reef? While joining forces with a dedicated team of daring scientists, Jack dodges bull rays, snatches nurse sharks and wrangles dugongs.