On Father's Day, Sophie gets upset that she has never received any Mother's Day gifts. Brian sets out to prove he is the World's Best Dad. Josh tries to gain the new video game "Gnomes Of Vengeance" from the new girl, Poppy Manning, but she will only give games to girls. Josh asks Lucy to get the game from Poppy for him. Lucy agrees on one condition – that Josh pays her £54.60. Mel is upset when Brian thinks she is a boy. The episode concludes with Sophie attempting to be more masculine by working out and Brian attempting to become more feminine by growing breasts.

Continued from the previous episode. Brian and Sophie's attempts to embrace the opposite gender become more and more extreme. Brian tries to be a better father by becoming more sensitive, while Sophie gets in touch with her masculine side. Josh still attempts to get the video game from Poppy.

When Lucy gets in trouble with one of her teachers for apparently copying homework, Brian and Sophie discover the power of punishment. Poppy writes an article in the school magazine criticising Josh. Mel accidentally kills the school budgie and Josh writes this in his own school magazine. To get revenge, Mel gets Brian to morph into Josh and take naked pictures of himself to give to Poppy to print in her magazine.

With Wendy away, Lucy is lonely and Mrs Hardman invites her to audition for Oliver, the school musical. Brian studies musicals by renting them all on tape. He sees that Oliver is an orphan like Lucy he thinks that this has caused offense. He speaks to Mrs Hardman and pulls the trapdoor lever so Mrs Hardman falls and breaks her legs. Brian resurrects the musical as BRIAN: The Musical. Sophie thinks that Josh has Parental Neglect Syndrome and follows him around school. Sophie then watches the Sound Of Music and learns how to really be a good mother. Mel has a bet with Trent that she couldn't last four days without insulting anybody but in the end it is Trent that breaks first and begs Mel to be mean again because that's the way he likes her!

Brian is desperate to join Lucy at the Brownies, but she refuses for obvious reasons. Undeterred, Brian forms his own association – The Brianies – with its own code of conduct. Meanwhile, Mel has got a job at the diner with Sophie later joining her to help her out...with some disastrous results.

Brian is still protesting for disabled access at the diner. But soon everyone notices that he is just lazy, until he actually has a wheelchair accident. Meanwhile Sophie changes places with the school rabbit so that Josh can get the reward money off Poppy Manning and Mel discovers that Francis is actually Frankie.

Mel heads for stardom as the presenter on the lunchtime programme on the school radio putting Trent's show out of the lime light. And because of Mel's success, Brian and Sophie learn what it is like to be fans and focus all their attention on... Mel. In the end, she is fired because of the resulting scandal with commentary at a sports game.

Brian becomes obsessed with death and tries to secure immortality for himself and the children – but things don't go according to plan.

Brian is turned into a vampire for Hallowe'en and targets teacher Whiteside as his first victim, while Josh and Pete vow to take revenge on Poppy Manning for scaring them last year. Sophie finds a love letter that Mel has written to Trent and concocts a plan to bring them together

The children are outraged to discover Sophie has put them up for sale on the Internet – and what's even more mortifying is the price she's asking. The family also get involved in the school charity fair, where Mrs Hardman ends up dancing with three different Joshes.

Josh, Pete and Frankie are in competition for the attention of a new girl in school, but there's a surprise in store for one of them when they discover who she is. Mel has left for Canada and Brian is suffering in her absence, so takes matters into his own hands by getting a 'new Mel' from the children's home, while Lucy is enjoying having a room to herself, which soon changes as CJ starts launching desperate attempts to move in, even resorting to 'becoming' a girl!

Josh and Brian vie to see which of them can tell the scariest Hallowe'en story, but Sophie can't understand why it's fun to be frightened.

When Harry cooks Brian and Sophie a romantic meal to help them patch up their differences after an argument, the aliens quickly go to the other extreme and become totally wrapped up in their passion for one another, (much to the children's embarrassment). However, when Josh tries to cool their ardor, Brian becomes convinced that he's trying to steal Sophie's heart. Meanwhile Lucy is up for a prize at school... until Brian and Sophie take it too far.

Sophie learns about gossip and thinks that Mrs. Hardman and Mr Whiteside have fallen in love with each other. Brian finds a human toe in his can of cola and finds out the drink was faulty and complains before he tests CJ’s eyes and discovers that he too is ‘faulty’. Josh competes in a snail race against Poppy, and the winner gets £5. Josh is convinced he'll win but when his snail is about to win Mrs Hardman comes in and Josh accidentally sits on his snail (Lenny) killing it.

Mel finds out that the children have or had an aunt and uncle in Canada who look suspiciously like Brian and (the original) Sophie. They confront Brian and Sophie, who admit that, seven years ago, they met Josh, Mel and Lucy's aunt and uncle at the children's home – and then, after the aunt and uncle realized that they were aliens, the aunt and uncle were kidnapped and kept in suspended animation in the attic for seven years. The children insist that they let them free. Meanwhile, Wendy discovers Brian and Sophie are aliens, and she tells Pete and Frankie too, so Brian wipes their memories. Everyone realizes that it is time to move on. Josh, Mel, Lucy, Harry and CJ all move to Canada with the real Brian and Sophie Johnson, and the aliens appear to go back home to Valux; however, Brian presses the big red button that caused the pair to crash-land on Earth in the first place setting the stage for series 8. They land by the sea and then head for the foster home.