海蟾蜍於1935年由夏威夷引入澳洲，以制衡本土的甘蔗甲蟲。現時，富侵略性的野生海蟾蜍，在澳洲數目超過兩億，嚴重破壞當地生態系統:吃海蟾蜍的本土動物正在消失、寵物和人中毒、本土動物被海蟾蜍捕食而瀕危、食蟲動物捕食日難。〈海蟾蜍大長征〉這齣三維電影，追蹤海蟾蜍長驅直進，縱橫澳洲大陸三份之一的土地，而且繼續擴張，進化為更大、更快、更頑強的生物。
Cane toads were introduced into Australia from Hawaii in 1935, as a means to control the native sugar cane beetle. Now numbering over 200 million, this invasive feral species has led to severe breakdowns in Australian ecology; the depletion of native species that die eating cane toads; the poisoning of pets and humans; depletion of native fauna preyed on by cane toads; and reduced prey populations for native insectivores. Shot in 3D, Cane Toads: The Conquest tracks the unstoppable march of the cane toad across the Australian continent, now occupying nearly a third of the country, and continuing to spread and evolve into a bigger, faster, even more robust creature.
