Doug loves two things... fun afternoons at the fair and eating a bellyful of sweets! When his mum promises both, he thinks it's his lucky day! Or is it... As he munches through his bag of candies and treats, tossing out unwanted wrappers and half-sucked sweets, someone or something is following the sound of untidy rubbish hitting the ground... Look out! Look out!

Dau beth y mae Doug yn eu hoffi... treulio prynhawniau yn cael hwyl yn y ffair a bwyta llond bol o losin! Pan fo ei fam yn addo'r ddau beth iddo, mae'n teimlo mai dyma ei ddiwrnod lwcus! Ond tybed? Wrth iddo fwyta'r losin gan daflu'r papur lapio, mae rhywun neu rywbeth yn dilyn sŵn y sbwriel yn cael ei daflu ar y llawr... Gwylia di! Gwylia di!