Leo is the ex-boyfriend of businessman Roman Pretty's middle daughter Nikki, who still works and lives with the family. Nikki's new boyfriend, Seb, has a shady past, which Leo tries to reveal to the Pretty family. His best mate Jase is married to the eldest sister, Jenny, and is constantly attempting to get away from her and their new-born daughter. Meanwhile, Japanese chef Mr. Hokkasawa loses his job at a restaurant after a complaint from Roman, and takes the job of the Pretty family's gardener in a plot to kill him as revenge. However, he falls for Roman's youngest daughter, Kelly.

Young orphans, Mel, Josh and Lucy, can't believe their luck when they are fostered together under one roof. But just when it looks like they have the chance of a relatively normal life, they discover their new parents are aliens from planet Valux!