Ollie and Rufus accidentally unlock the mythical overlord mode of an unbeatable computer game called Open Space, then discuss how to best exploit their discovery. Jam9T7, celebrity vlogger and ex-student of Cranmede, is returning to the school to do a live vlog so Kat suggests Rufus and Ollie invite him onto their Open Space Talk vlog to maximise exposure.

Lily is worried that she and Rob don't have a song and sets out to find one that they don't just love, but love love. Meanwhile, Ollie agrees to host a school radio show with Martha, while Hunter tells Jas that she would be a great agony aunt. And Rob asks Mr Malone to write a song for him, which Ollie agrees to record. Lily finds it sweet that Rob asked Mr Malone to write them a song, until she hears it.

The sixth formers complete a computer programme, designed to help them choose and experience the career they want to do when they leave education. Meanwhile, Lily's celebrity lifestyle is short-lived - she is to be a method actor playing a potato sack-wearing, humble milkmaid from the middle ages. And Ollie's task is to devise a marketing campaign for a washing up liquid, causing him to regret not selecting a science career.

Lily gets addicted to a virtual reality game, Ollie is forced to express his feelings and Martha wins a competition she didn't enter.

Lily wants to have a perfect Christmas when Ollie is allergic to Christmas, Sid hates Christmas, Rob thinks Lily's presents are terrible, Jas is upset with Sid and Martha is leaving.

Determined to be head girl, Martha goes head to head with best friend Lily. Meanwhile, Ollie has a terrible dilemma to resolve.

Kat's plan to outdo Martha backfires, while Jas and Lily help Martha and Ollie spend time apart to deal with their suppressed feelings for one another.

Jas and Lily plan to go travelling together but soon discover that they don't share the same idea of a perfect holiday. Lily asks Martha and Ollie to help persuade Jas to back out.

Mr Malone holds a mock trial to resolve a dispute Martha and Ollie are having over the ownership of Edison, a cuddly lightbulb they won together at a fairground hoopla.

Lily tries to convince her friends that she is a top model, Martha gets a job in Mugshotsz and Ollie tries to be cool like Sid.

Lily's new boyfriend Bob is so like Rob that Martha and Ollie use science to prove Lily is not over Rob, which leads to a shocking discovery. Meanwhile, Mr Malone offers terrible advice to Jas.