Chow Ti is a poor construction worker. He lives in a partially demolished house with his nine-year-old son, Dicky. Ti is eager to save money so he can continue sending his son to private school. However, Dicky is often bullied by other children and chided by his teachers at school because he is poor and wears shabby clothes.One day, while at a department store, Dicky begs his father to buy him a popular robotic toy called CJ1. Ti cannot afford it, and the situation ends badly when Ti smacks the stubborn Dicky in front of other customers. Dicky finds comfort in Ms. Yuen, his schoolteacher, who is passing by. That night, Ti visits the junkyard where he often picks up home appliances and clothes for Dicky. He finds a strange green orb and takes it home, telling Dicky that it is a new toy. He is hesitant at first, but later accepts it.CJ7 2008.
The next day, Dicky brings the orb to school and gets beaten up by the other children only to get injured and scolded by Ti. The following evening, the green orb transforms into a cuddly alien creature that befriends Dicky. After playing with the alien, he names the alien “CJ7”, and then falls asleep (with an apple on his mouth) dancing in happiness. He dreams that the alien will help him gain popularity and good grades at school.When a group of students see the alien with Dicky they forcibly take it and try to cut it but nothing seems to work. At last they try to use a drill and Dicky jumps on them. Dicky tries to hit one of the students but a fat boy stops him who in turn is stopped by Maggie, a fatter and much larger girl. They are then punished for fighting and expected to explain the situation. When the teacher, Mr. Cao, leaves, CJ7 comes out from hiding and Dicky gets it to perform tricks for the other students and they are awed. Dicky thanks Johnny, the leader of the group of students, for not letting Mr. Cao know about CJ7. They shake hands and agree to not let the adults know about it and buy the group one.