肥猫（郑则士）本是一个智力正常、天真可爱的婴儿，不幸染了黄疸病，加上父母照顾不足引致中度弱智，父亲竟感难以面对，故一走了之。伟大的母亲（鲍起静）却坚决不放弃，遂带着肥猫回自己的外家——长洲，把他抚养成人。虽然肥猫是中度弱智人士，但他对自己的人生却充满希望，对别人更是真诚、善良，而且还有一颗赤子之心，对母亲十分孝顺。从未踏足香港区的肥猫，因一次母亲到港做小手术而爱上都市五光十色的生活，决定到香港区定居。后来遇到一位贪玩任性的小女孩奇奇（王嘉明），两人成为好友。可是奇奇仍是积习难返，常跟着坏男友阿柏（秦启维）四出闯祸。主要处理肥猫与奇奇之档案的社工康春明（江美仪）对两人很关心，而明有一位要好的男友庄永佳（邓浩光），本来两人感情已相当不错，但佳立心不良，只想借助有钱女当娜（张文慈）父亲的财势来达成自己创业的理想。于是与当娜发生关系，但当娜对爱情绝不专一，更向佳掷钱将他赶走。 另一方面，奇奇与阿柏犯案被捕，但阿柏竟将一切罪责都推在肥猫身上，幸好奇奇最后良心发现觉悟前非，指证阿柏，使肥猫得以逃过一劫。后来肥猫在母亲店铺内无意中遇到俨然是自己心中的白雪公主——李少芳（宝佩如），虽然芳也是轻度弱智，但两人很快便堕入爱河。几经波折下，肥猫与芳终于可以成为一对，并且建立了一个快乐的家庭。而佳最后也浪子回头，经纯真坦白的肥猫开解后，明亦原谅了佳，结果双双再续未了情缘。
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