退休沙展范根（冯淬帆）与高级警察李国江（黄锦燊）本是同胞，后因一闪严重过失，范根代替李国江承担责任而遭革职之后，范在贤姐（李殿朗）的发型屋内任发型师，并得到贤姐芳心暗许，但可惜范根爱子身染重病每年需要换血费用甚巨，范为替其子彻底治病，秘密为黑帮首领洪驹（王伟）任杀手。
阿B（李修贤 饰）是和母亲同住狭小老旧公寓的便衣刑警，他为人热血办案手法大胆，令新报道的同事阿杰（艾迪 饰）大开眼界。阿杰与阿B性格迥异，一心只想通过考试晋升警官。阿B压制分别住在山上村和山下村的两位大佬小黑与红番，并通过红番手下的毒虫小弟阿成（太保 饰）买得多个线报，阿B获悉犯罪信息立下功劳，令阿杰亦得到嘉奖，二人友谊日盛一日。不久，阿成因毒瘾反复发作，犯下大错，被小黑和红番连番毒打，终至丧命，阿B调查阿成死因，追查小黑，不料却引发意外，将自己逼上绝路，而小黑也只得选择铤而走险，警匪都再别无选择……
Summary Bullied by his matriarchal mother, abused by his siblings, ignored by his father, Poil de Carotte's childhood is as miserable as it could be. An illegitimate child, he is the main reason for the enmity which exists between his parents, who continue to live together just to keep up appearances. In the end, Poil de Carotte's suffering becomes more than he can bear... Review Drawing heavily on the poignant novel by Jules Renard on which it is based, Poil de carotte is a modest yet appealing film which has stood the test of time mainly because of the quality of its acting performances and its inherent humanity. It is more memorable than Julien Duvivier's earlier silent version of 1925, also named Poil de Carotte. The part of Poil de Carotte was played by 11 year old Robert Lynen, who was alleged to have been discovered whilst walking down the Champs-Elysées in Paris. Lynen is totally captivating and the film made him an instant star, launching what looked like becoming a very promising film career – until he was shot dead whilst fighting against the Germans in 1944. Harry Baur, a legendary stage and film actor (who also died during World War II, allegedly at the hands of the Gestapo), also turns in a typically fine performance. The reconciliation between father and son at the end of the film provides its most enduring image, enough to melt the heart of all but the most stoical of spectators.
小双（麦浚龙 饰）幼时最大的爱好是与父亲一起观看《宇宙大帝》并幻想自己是保卫地球的英雄，然而8岁那年，父亲因为保护警察而死在街头悍匪的抢下，小双的梦想从此破灭，只有好友孤儿大鹏仍然坚信他们的“地球保卫队”始终存在。小双因为身手出众，被韩先生（王羽 饰）的松本集团召为保安，与大木（林家栋 饰）等干将做了同事。小双因保护韩先生之女安妮（邓丽欣 饰）得力，被派为后者的专属保镖，日日陪同。是夜，大木等老手下因不甘心利益被韩先生攫取，发动叛变，韩先生身亡，小双身负重伤，幸好被长期暗中保护他的神秘人救走，原来神秘人乃是当年小双父亲保护的警察之子。大木控制公司后为非作歹，小双遂与众好友街坊组成地球保卫队讨伐恶人
