Imagine if your heart stops beating twice. Osborne is stung by a deadly box jellyfish while swimming at a beach in Queensland. With so much pain and a stopped heart, how will he survive? Meanwhile, backpacker Justin gets a taste of this dangerous animal when he is chased by a pack of dingoes. Then, Ian is bitten by a venomous spider while gardening, but it is only hours later when slow paralysis sets in, making him realize his life is in danger.