It is Christmas Eve and Dani and the gang get to welcome old pal Toby back from university. Meanwhile, Dani's brother Max is getting into the yuletide spirit - and demanding loads of presents. But, that night, Max is visited by a series of ghosts, who do their best to teach him the real meaning of Christmas.

When ever-unfit Jack enters a fun run for Sport Relief, Dani and Sam are convinced he will never make it round the course and so offer to sponsor him for ridiculous amounts of money. It soon becomes clear that Jack is taking his running all too seriously. Dani decides to undermine her best friend. Meanwhile, Max sees Jack's run as the perfect way to raise some sponsorship cash for his own favourite cause - himself.

Sam, Jack and Ben are all sick of Dani and Max's endless fighting. They agree that Dani and Max would get on better if they understood each others' lives better, and force them to swap places for a day. Unfortunately, it's the day of an important audition for Dani and a major chess match for Max. How will each of them ever manage?