The film starts with the S Club 7 traveling through a desert on their way to LA, they look at the milometer of the car and realize it is has reached 999999 and after the next mile it will reset back to 000000. Hannah closes her eyes expecting the worse to happen, but to their disappointment nothing does happen. Although, without realising they entered a wormhole and traveled back in time.

When they arrive in the fifties they head straight to the Big Cup Diner and Hannah quickly becomes very good friends with the waiter, Chuck. When S Club 7 hear that Chuck's diner is in danger of being closed down by Chuck's enemy, they put aside their attempts to get back to 1999 and make a plan to help save Chuck's diner.

First they hold a huge party, then in the style of 'Grease' they hold a car race between S Club 7 and Chuck's enemies. Along the way, Hannah and Brad both manage to catch a snog scene and some of the S Club even end up in jail for fighting with the enemy!

Rachel drives in the race and they win...

When back in 1999, the S Club travel back to the town to see that Hannah's boyfriend, Chuck, is an old man!

S Club 7 sing: Sclub Party, Friday Night, Viva La Fiesta, & You're my number 1.