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The Happy Gang are taking a relaxing holiday on Castaway Island at the restful resort of Coconut Bay - but they soon get bored! Seeking adventure, they apply for jobs as lifeguards with 'Coconut Baywatch' but soon discover swimmers and sun worshippers are disappearing - and there are reports of mermaids in the Bay. Something fishy is going on and the Happy Gang realise the chips are down. By chance they discover nutter professor Ron Prawn's dastardly plan to rule over an undersea kingdom, with his headquarters on Castaway Island. Can the Happy Gang save this tropical paradise or will Ron Prawn's evil day dawn? The Happy Gang's Castaway Island website.