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.

Josh introduces Brian to a weekend of slobbing and Mel teaches Brian about manners. Josh bets with Mel that he can turn Brian into a gentleman and he does it, but Brian turns into an old grump. Also he invites Trent (whom Brian calls 'Trentington') round for dinner with disastrous results. So now, they've got to make Brian back to normal.

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.

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

Brian looks for meaning in his life and invents a religion (which he names Brianism), while Sophie becomes obsessed with celebrity magazines. Lucy objects to CJ saying a certain word, so he tricks her into saying it herself

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.

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.

Harry does her best to stop Brian and Sophie inviting Trent's parents to tea. Harry learns a "shocking" secret about Trent, Sophie gets into growing vegetables and Brian gets into football.

Sophie turns the living room into a pleasure beach. However, Brian's attempts to have fun have miserable repercussions for Eddie, who ends up buried in the sand.

Brian discovers a treasure chest, and sets out on a mission to splash the cash. Meanwhile, Sophie confronts a teacher that has insulted aliens, and Eddie breaks his friend's new computer.

Brian and Sophie find a huge Christmas tree. Without knowing how much energy it uses up, it threatens to blow up the spaceship. Eddie gets his confiscated Christmas present back and Jaq comes back home. Dan, Becky, Eddie and Jaq need to de-frost Brian and Sophie. After de-frosting them the meltdown only has 30 seconds left. Sophie's too frightened to press one of the four buttons and with three seconds left will the spaceship blow up or not? At the last second someone presses a button, but who is it and is it the wrong button??