Ollie, Rob, Jas and Sid enter Battle of the Bands with tuneless Mr Malone. Lily wants her mum's boyfriend Ken to like her and Jas tries to introduce boyfriend Sid to her dad.
On the day Martha asks Lily for the 7p she owes her, Lily inherits a lot of money. Determined to prove Martha is petty, Lily decides to share her wealth with everyone.
Lily's gut instinct tells her that fellow pupil Carla fancies Rob. Rob denies this but Lily sets out to prove her gut instinct is correct with the help of Martha.
Snobby Ollie mocks Mr Malone's ancestry, inspiring the gang to teach him a lesson. Then when Ollie discovers he's actually related to Mr Malone, his dreams begin to unravel.
Rob enters a modelling competition and Lily is determined he will win using 'the look.' Martha practices dating, only her lovestruck date Rufus doesn't know it's just pretend.
Lily plans a perfect date night to celebrate her anniversary with Rob - but her mum and Ken might ruin everything. Meanwhile, Martha reluctantly agrees to a tech detox.
Martha and Ollie are confident they can win the McSherman Science Prize, but they have one tricky formula to work out - how to subtract Rob from their team without losing Lily.