Brian decides that he and everyone else should become a proper family so Brian enters a quiz night, however Lucy doesn't want to join so she goes to join Wendy's team and ends up playing against her family who will win and what will happen?

Lucy discovers she and her best friend are 'geeks' after they are the only two girls in the class not to be invited to a party. Mel gives Lucy a makeover, but this threatens to alienate her from Wendy, with whom she has been studying caterpillars. Sophie is struck down with a case of the flu, but enjoys her freedom from housework and responsibility and hides her recovery. Lucy decides friendship is more important than being 'cool', and she and Wendy discover that their caterpillars "were really butterflies all along."

Josh injures himself during sports, so Brian attempts to fix him with a home-made machine. However, the machine instead makes Josh a chess champion and a maths prodigy by mistake, making Lucy feel threatened as she is outplayed in chess.

Lucy and Wendy are on the verge of falling out, as Wendy is upset that Lucy never invites her to her house. They arrange a sleepover, and Sophie and Brian must act as normal as possible. Meanwhile, Josh is charging Sophie for doing chores around the house so that he can later buy a snooker table.

Lucy is selected to represent the school in a Science Tournament where she has to build a rocket with maximum propulsion – which proves to be too difficult a task for her, so Sophie offers to help. Brian enters one of Mel's photograph's in an art contest. Josh tries to bribe Scott Taylor into letting him join the football team and get to go to Holland and almost loses Frankie and Pete as friends.

Mel goes to school in trousers, as she feels the school rule that girls must wear skirts is sexist, whilst Lucy is looking after the school hamster which Josh promptly loses by trying to make some money with it.

Lucy's birthday is arriving, and she wants a party. While she thinks no-one is interested, the family is planning a secret party. When Sophie becomes pregnant, Josh is elected to give Brian 'The Talk' on the facts of life, with help from a book from the school library. However, Brian later becomes pregnant as well. Lucy plans a party with Wendy, will her friends come over, before Brian and Sophie's babies are born? And how will Lucy's party go?

Mel asks Scott Taylor to the school Christmas disco, causing Trent to get jealous. Lucy is cast as Mary in the Nativity play, a part Wendy wants. Josh fills Brian and Sophie in about Christmas. Lucy gives Wendy the part of Mary in the play, but Wendy becomes extremely demanding. Mel gets cold feet and won't go to the disco, so Brian morphs into her and goes in her place. Mel finds out and rushes to the disco, only to find Brian-Mel kissing Scott, right in front of a heart-broken Trent! Mel attempts to repair the damage caused by Brian, only to find out some things about herself. The school Nativity play becomes a strain on Lucy and Wendy's friendship. Josh has nightmares and is visited by ghosts in a plotline similar to that of Dickens A Christmas Carol.

Mel asks Scott Taylor to the school Christmas disco, causing Trent to get jealous. Lucy is cast as Mary in the Nativity play, a part Wendy wants. Josh fills Brian and Sophie in about Christmas. Lucy gives Wendy the part of Mary in the play, but Wendy becomes extremely demanding. Mel gets cold feet and won't go to the disco, so Brian morphs into her and goes in her place. Mel finds out and rushes to the disco, only to find Brian-Mel kissing Scott, right in front of a heart-broken Trent! Mel attempts to repair the damage caused by Brian, only to find out some things about herself. The school Nativity play becomes a strain on Lucy and Wendy's friendship. Josh has nightmares and is visited by ghosts in a plotline similar to that of Dickens A Christmas Carol.

Brian and Sophie become hooked on a trading card game, and will go to any lengths to obtain more cards. They end up stealing and selling the school laptop. They then discover there is a rare card (Madonna) that they need to find. They find the card, but realise they have wasted their time and money. They feel very silly.

Lucy discovers she has a talent for judo, and Brian thinks the only way to keep her as his friend is to tag along. Sophie then decides she wants to be Trent's friend. However, she later brings a live duck into the house to cook. Trent gets upset when he sees this and asks her what's going on. Mel tells him that Sophie is making a statement about vegetarianism, so he thinks they are vegetarians. Meanwhile, Lucy gets ready to go to Paris for a judo competition.

Brian and Sophie are not technically married, so Lucy arranges a wedding to bring the family closer together, but her grand ideas are nothing compared to Sophie's. Brian learns it is hard to choose a best man. When Mel gets angry about the wedding, they decide not to have a proper wedding, but a friendship ceremony instead.

Josh fails his biology exam and has to retake it in 2 days. Brian goes to see Mrs Hardman and says he can do better and can make Josh clever. Brian morphs into Josh and does the exam instead. Meanwhile, Lucy is having troubles in the orchestra because she can't play her instrument and gives up.

It's Valentine's Day, and Josh is trying to get a date with Tanya Thomas, but makes the foolish mistake of taking Brian's advice on matters of the heart. Mel is the object of desire of Andy the Freak and Frankie when all she wants is a 'joke' Valentine's card from Trent. Sophie follows her heart and writes a card to her true love: the dishwasher. Sophie asks the family what Valentine's Day is, but in an episode a few years ago when Barbara Durkin played Sophie she is trying to act calm in front of a teacher who has come to visit the house and she says "This happened to me once on Val.... Valentine's Day".

When Lucy wants Brian's help with her magic act, his ambitions go far beyond being her assistant. Mel runs in the school's sponsored FunRun with Andy the freak in a pantomime horse costume.

On Halloween, Josh has a plan to run a tour of the school, with Frankie and Pete helping to spook the students. Mel wants a Halloween party but is so scared that no one will turn up that she advertises the event as Trent's party. However, no-one wants to come a party held by Trent either and the two of them turn out to be the only ones there. During this episode there is one of the many obviously romantic moment between Mel and Trent when they almost kiss in Mel and Lucy's bedroom.

To celebrate their "phone-iversary" Josh convinces Sophie and Brian to buy him a new mobile phone. Sophie also gives a mobile phone to Brian, however the phone wipes his mind of all his alien memories. Meanwhile, Josh believes his mathematics teacher has fallen for him. Josh, Lucy and Wendy all discover love through texting.

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.

Today Mel is fed up with Lucy's controlling behaviour and decides to move out of their bedroom and into the attic. Sophie sees this as the perfect opportunity to step in as Lucy's new sister. Lucy is incensed, but when Sophie and Wendy abandon her too, she begins to wonder whether she might be in the wrong after all. Josh is desperate to scam Frankie's signed united football shirt from him, and Brian agrees to morph into Mel as part of a cunning plan. But Josh is about to get a taste of his own medicine for once.

Josh is confident that his "treat 'em mean, keep 'em keen" tactics will eventually win the heart of his school friend Tanya. Sophie decides that humans tell lies all the time, making her highly suspicious of everything her family says. Mel persuades Trent to let her stand in for him as school magazine agony aunt, but can she really summon up as much sensitivity as he does? Mel's determined to prove to him that she can. In a desperate bid to prove to Josh that he can lie convincingly, Brian tells Pete that Tanya fancies him. But when Pete and Tanya arrange a date, Brian has some quick thinking to do before Josh's heart is broken. Brian discovers that lying can cause a lot of trouble, while Mel finds out that telling the truth can, too.

Josh is woken by a trumpet-playing Brian and is offered tiddlywinks for breakfast. His sisters may be technically human but they still can't behave like normal people. Why can't his family just be different in every way? A bump on the head makes Josh's wish come true, throwing him into a world of complete opposites. Lucy is stupid, Mel cares about what she looks likes and fancies Frankie, Sophie doesn't even try to be a good mum, Pete is short and fancies Mel and Frankie is tall doesn't like Mel but all of the other girls fancy him. Wendy is his girlfriend and like Lucy, is thick, but more clumsier than Lucy. And Mrs. Hardman is the art teacher and fancies Brian. This leaves a whole world of confusion and he wishes that he could have been fostered by someone else.

Meanwhile, the opposite Lucy and Wendy, are trying to write a story to win a day with Chubby the Bear but don't write much. And when Sophie enters too, Josh has to stop her from entering.

Lucy and Wendy have an argument that might end their friendship for ever. Josh has laryngitis, but despite Sophie's best efforts to nurse him back to health, he quickly loses patience with her bedside manner. Sophie finds that being ignored can make you feel like you don't exist at all. Brian is jealous that Trent has given Mel a music festival ticket and morphs into 'Spam' – a hip and trendy girl that will catch Trent's eye. His plan works, but Mel is devastated that Trent has found someone else. Can Josh and Sophie persuade Brian to make amends before Mel's heart is broken and Sophie turns invisible from a lack of attention? Wendy moves to Birmingham for a few months.

Brian and Sophie learn about age concerns which leads them to either wanting to move in a retirement home or get wrinkles! Meanwhile, Josh's voice breaks and uses it to pretend he's Brian phoning school to say that Josh is ill.

Lucy is the captain of the school chess team and Brian starts to feel proud of her achievements. In an attempt to feel proud, Sophie imprisons Josh in his room, now a cell with a Telescreen, where he is forced to study and exercise, as in Nineteen Eighty-Four. Josh fails in his studies, but instead creating a clever means of escaping punishment from Sophie and her electronic torture device. Though Sophie learns the truth, she find pride in Josh's elaborate lies. Meanwhile, Brian takes Wendy's place to ensure that the school win their chess competition, learning, however, that pride is not found through cheating.

After Brian accidentally leaves the front door open, Brian and Sophie come home to find all their furniture stolen. Brian responds by morphing into 'The Cat' to steal furniture from other homes, and this becomes his latest hobby. Josh discovers Brian's secret and (predictably) uses it to his own advantage. Meanwhile, Sophie becomes obsessed with home security, putting traps everywhere (which are mostly triggered by the Josh rather than burglars) and fears about the burglar worry Lucy so much that she begins to wet the bed.

Brian decides to give the attic, now filled with a bed, cinema screen, drinks cooler, &c., to the member of the family who loves him the most, but Lucy walks away from the contest, saying she loves Brian as a father, "no more, no less". Josh and Mel then compete in vain to win Brian's affections. Meanwhile, Sophie tries to boost her self-esteem. Based on Shakespeare's King Lear.

Lucy is horrified to find a wart growing on her face. But not as horrified as Brian, who has discovered the real purpose of the bath; he develops a taste for shower gel and is obsessed with hygiene-until he starts shrinking!

Sophie decides to accompany Lucy to advanced mathematics classes after school, but it soon becomes clear that Sophie has fallen in love with Mr. Whiteside, the teacher. Brian feels that he is losing Sophie (and her ability to cook disgusting meals which deeply satisfy Brian) to Mr. Whiteside, so he sneaks into school and kidnaps Mr. Whiteside, and then morphs into Mr. Whiteside himself, to try to pretend to Sophie that Mr. Whiteside is "evil". Unfortunately his plan is ruined when Sophie invites Brian and Mr. Whiteside to have a meal together with her.

Brian is out buying a bicycle, but ends up in a wheelchair. Not that he had been beaten up, but he loved the wheelchair and rejected the bicycle. Lucy overhears Wendy's Mum saying to Mrs. Hardman that Wendy only has four weeks to live. Meanwhile, Brian protests at the diner for disabled access and Mel is recovering from a mud mask that went horribly wrong and having to be guided round school by a guy called 'Francis'...which is actually Frankie!

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.

Sophie helps herself to a baby in the supermarket. Shocked the kids insist it must be taken back, which leaves Sophie feeling broody. Brian obliges her by morphing into a baby with...disastrous results and resorts to Sophie looking after another baby from the children's home. Meanwhile, Josh is desperate for a new games console and Lucy wants to buy some new clothes for seeing Bill Gates.

Mel goes into training to become an ace pool player, so as to be able to play with the boys. Brian gets in touch with his 'feminine side'.

Dissatisfied with the level of affection his foster son is prepared to show him, Brian creates a robot double of Josh... and causes total chaos. The robot Josh in one scene parody's Johnny from The Shining.

Brian kills a spider and is so ashamed that he sets up an animal sanctuary – in the house. Sophie suspects Lucy has a secret boyfriend called Derek

Josh finally manages to land a date with gorgeous Tania Thomas, the girl of his dreams, but it soon goes all wrong after Brian & Sophie have created a super strong glue mixture. This is one of the two episodes where the Bathroom in the Barker-Johnsons household is seen.

Josh's latest scheme ends in detention after he sells a computer password to Frankie, while Brian watches a series of sci-fi films and discovers the general public believe aliens to be bad guys – so he sets about changing people's opinions.

Josh builds up his muscles to impress a sporty girl, but Brian's attempts to help him land a date with her end in disaster. Sophie leads a classroom revolt against her teacher, and Trent blackmails Mel over a pair of pants.

Brian decides to take up a hobby and begins collecting spoons. Mel tries to express her feelings for Trent by putting together a tape of songs while Sophie becomes a rapper and disrupts the school concert with a raucous performance.

Brian is excited about what he will get for Christmas until he finds out that Santa has a "naughty" list, and he's afraid that he may be on it. Meanwhile, Sophie is trying her best to find out what Lucy has got her for Christmas and Josh is looking after Frankie's present from Pete.

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!

"Great Versace's ghost!" Brian cries as he takes the role of fashion designer and forces the children to wear his fruity clothes and curtains. Meanwhile, Sophie collaborates with Josh in yet another fraudulent scheme, this time a pet selling scam involving a pot bellied pig, and a lot of icecream...

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.

After CJ nearly chokes on a gobstopper, Brian decides to learn some first aid in order to keep the family safe. After injuring the school nurse, he morphs into the replacement and Mr Whiteside falls in love with him. Josh meets a girl but when he realizes that she is a psycho, pretends to be gay, going out with Pete until he finds out that she is rich. Lucy tells the girls in her class that she wants to get her nose pierced making her instantly popular... until she reveals that her piercing is a fake! Because of this piece of metal she goes from −100 to hero...and straight down again!!

After worrying that he will not be remembered when he dies, Brian goes on a quest to find the Holy Grail with CJ. Josh participates in work experience at the diner. Wendy and Lucy start a company producing potato powered clocks, and Sophie helps make them, however, she is told off by Lucy for giving them all away free. Sophie then founds "Sophie.com International" which sells useless coconut toys, yet these are a hit. Her business is about to go international until Lucy discovers she is enslaving children to make the toys.

Sophie tries to help Josh woo Tania by turning him into a talented musician. Brian is introduced, by CJ, to the ancient Roman concept of fascism and quickly imposes his own absolute rule on the household to get his way – idea of democracy and declares himself emperor of the household.

Sophie decides that she must become a nanny in order to see more of the children. Meanwhile, Mr. Whiteside thinks he's seen a ghost after Brian morphs into the spitting image of a long-dead former school headmaster. Lucy, worried about a test, downloads an alien virus into the school computers however this takes a downward turn.

Brian's hostile behaviour puts the family at loggerheads with their new neighbours, Brian doesn't get on well with them since he eats their roses (calling it 'The War Of The Roses') – which proves unfortunate for a love struck Lucy.

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.