Casey, Hannah and Lucy are three sisters from Manchester. They love their car, 'The Big Boo', but his insides are very tatty, he's covered in bumps and scratches and the family have been warned that he may not pass his next MOT. Ali-A and his supercharging team step in to save Big Boo from the scrapheap and give him a brand new look.

At Superchargers HQ, Casey and her sisters brainstorm ideas with Ali-A and soon have a disagreement over their favourite colour for the car. Mum and Dad can only listen in horror at their wild ideas, but one thing's for sure: Dad hates all their suggestions! Before the sisters can decide which colour to go for, they take Big Boo to the Superchargers workshop where mechanic Rebecca helps them fix all his problems including replacing his brake pads. Show less