An army of toads, millions strong, sweeps across the Australian continent. Equipped with a deadly toxin their march is relentless. As the toads march towards the city of Darwin its residents prepare for the onslaught. Should they dig a trench? Set out traps baited with special lures? Arm everyone in town with golf clubs? Can anything stop the invasion of the killer toads? For the past 70 years, an invasion of cane toads has marched across northern Australia like a biblical plague. First introduced to Australia to eat farm pests, the toads immediately began multiplying and wreaking havoc on native wildlife. These over sized amphibians are armed with a toxin so potent it can even kill a full-grown crocodile. Now, poised at the gates of the continent's last frontier - the giant toads are set to complete their invasion of Australia's tropical north. And while they have yet to kill any humans here, residents are taking no chances. As scientists belatedly race to study why these toads are such effective killers, the amphibians march toward Darwin - much to the chagrin of its residents. This new action-packed program from National Geographic Television & Film includes great natural history, science, invention, humor, incredible predation sequences and CGI.