TheBoyInTheDressisthestoryofDennis,a12year-oldboywholivesinanordinaryhouse,inanordinarystreet,inanordinarytown,buthefeelsdifferent.Hismumhasgoneoffwitharooferandheliveswithhisdad(SteveSpeirs)andbrother.Everythingisboringandgrey.Denniswantstoescapetosomesortofmagicalworld,anddiscoversitinthemostunexpectedplace-Raj’snewsagent.AchanceviewofKateMossonthecoverofafashionmagazineintroducesDennistoawholenewworldofcolourandcreativity.ThankfullyhehasanallyinLisa,thecoolestgirlinschool,whodecidestoteachhimeverythingsheknowsabouttheworldoffashionandclothes.Dennisisenthralled,andafteralittlepersuasionfromLisatriesonadressshehascreated.SoontheydecidetotryandpassDennisoffas‘Denise’,Lisa’sFrenchpenpal.Butcanaboywearadress,andwhatwillhisHeadmasterMrHawthornthinkifhefindsout-letaloneDennis’sdad,hisbestfriendDarveshandhisschoolfootballteam-mates?
故事叙述叛出师门的童虎（高飞饰）为取得师门密藏之宝剑，率弟子夜闯师门。童虎虽成功击败师门众多子弟，得知宝剑所在，却苦于藏宝处需七星甲焉能开启之门。七星甲的持有者马奶奶（赵冈生饰）为一武术高手，惟其孙小狗子（孙国明饰）自幼因祖母的宠爱呵护而在武术方面并无深究。但在受到久别重逢的青梅竹马虎妞（邹美仪饰）的强势态度和惨败于为夺七星甲而来的童虎徒弟下，小狗子始体认到自己应致力于武学。于是在马奶奶的安排下，小狗子带着七星甲逐投师伯苟不理（梁家仁饰）处学习武艺。一日，小狗子与苟不理回村探望马奶奶，岂知竟发现马奶奶早已丧生于上门夺甲的童虎一行之手，童虎等更向小狗子二人出手，欲夺得七星甲。幸在苟不理帮助下，两人全身而退。回到苟不理居所后，小狗子立誓将勤加练武，必为马奶奶报仇。
