When Lucy wins tickets to see Blink 182 in a competition, Josh is desperate to take them off her hands – after all, he's a huge fan of the band, and Lucy's such a geek she's never even heard of Blink 182. Lucy agrees to give the tickets to Josh, but on one condition: Josh has to perform a truly unselfish deed in order to qualify for the tickets. Of course it's a terrible struggle for the scam-meister, but Josh learns a whole lot about himself in the process. Elsewhere Mel is upset (though refuses to show it) when Trent appears to be going on a date with another girl. The confusion is resolved later in the episode when it turns out that Kelly is Trent's cousin, not his date and he and Mel become friends again.

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.

Josh wants to have a wild party for his class (including resident tough-guy, Big Verne) so he tries to make the rest of the family go on a holiday. Mel is aggravated by her family's constant need for attention when all she wants some privacy to write a song to enter into a competition with Trent.

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 manages to get her way in the house, organising chess nights and debates. Due to this, Josh gets the idea to run for school council. He claims if appointed, he would get all students entry to the prefect's room, much to the anger of Mel. Mel has a secret weapon – if he continues in his plan, she will blackmail him with a karaoke tape of him singing along to Britney Spears. But then when she puts it on in the school Josh starts to sing and everyone gets dancing so Mel gets annoyed and leaves with a sulk.

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.

Mel gets a job offer as an assistant to a fashion photographer. However, her audition takes place during school, so she goes to the audition whilst Sophie (who is not a very gifted morpher) morphs into Mel and goes to school. Unfortunately, she goes around kissing everyone, including Trent, Frankie and Mrs. Hardman. She is referred to a child psychologist. Sophie panics when seeing the psychologist and Mel arrives to take over. She soon transforms to a lady with Red hair to make sure the psychologist doesn't see there are two Mel's. However, Sophie cannot morph back to her original human form, and decides to keep another look, thus introducing a new looking Sophie (Carla Medonça).

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".

An alarm sounds in the household – signaling that there is a Valux rescue ship nearby. Brian and Sophie are faced with a difficult decision: go home, or stay with the children. The children are horrified that they might be abandoned again and recall (in flashback) the day they were fostered by a very different-looking Brian and Sophie. Lucy was desperate for a family, Josh was still looking for fringe benefits and Mel was desperate to avoid disappointment. Can Brian and Sophie be persuaded to keep their family together?

Brian and Sophie adopt a new child: Howie. Howie turns out to be a safety freak, much to the exasperation of Mel, Josh and Lucy. Seeing their reaction, Howie runs away... and then the children's social worker comes to the house for Brian and Sophie's progress report. Due to objections from fans of the show saying that Howie was too annoying the character was discontinued after this one brief appearance.

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.

Brian feels rejected when Sophie chooses to watch repeats of Geoff Jefferson, Criminal Prosecutor, on cable TV, instead of taking part in his indoor Olympic Games. Josh also has grievances with Sophie's television hogging – the wrestling team have paid him in advance for tapes of special shows. This is not true. Lucy cuts the cable on the TV to end the suffering, but it ends up with Sophie putting Brian's pet rat on trial. Brian is devastated, so tries to put the blame on himself. Lucy then admits and ends up being captured and rescued on the same night.

Brian has a new pet: Fluffy the goldfish, but when she's fed on a diet of fried egg, bacon and beans, the unfortunate Fluffy soon floats off to the big fish tank in the sky, leaving Brian devastated. He then holds a funeral for his beloved Fluffy, which goes well. Josh attempts a challenge at the diner: eating 50 courses. He asks Brian to morph into him, and eat 48 of the courses. The first course is fish fingers, devastating Brian. He quits, leaving Josh to eat all the food. Mel later takes out insurance with dozens of spare goldfish, which she stores in the bathroom, and Brian thinks that the new fish is Fluffy back from the dead.