Mark Lewis explores one of Australia's greatest environmental catastrophes as he follows the unstoppable march of the cane toad across the Australian continent. The South American cane toad's unstoppable journey across the Australian continent has long been the focus of great controversy and bizarre fascination. The cane toad was introduced to Australia in 1935 in an attempt to control the greyback cane beetle. Unfortunately, the toads were disinclined to eat the beetles. Instead, they set about doing what cane toads do best - multiplying, migrating and thriving. This program explores the history, the science, the human conflict and the bizarre culture surrounding this notorious environmental blunder. 1. Toads ; 2. Pests ; 3. Introduced species - Environmental aspects 4. Pest control ; 5. Sugar industry - Queensland