When an asteroid is forecast hitting the Earth at 3.20pm, it is blamed for a series of malfunctions. Fran and Maria attempt to love match Natasha with Mr. Brisley.
Barry Timpson is chased round school, Ray's girlfriend (really Kenny's) impresses everyone, Techno falls out with Spanner, and Fran and Maria steal Natasha's diary.
Impatient for the school to buy the camcorder, Ray gambles the fifty quid raised so far on Grange Hill winning a five-a-side match against St.Joseph's.
Mrs. Monroe cancels a potentially lucrative advert film shoot, but Ray gets Justine to phone to reinstate it. When the film crew arrive, the footballers auditioning aren't what the producer expected.
The camcorder is purchased with money from the advert, Mr. Robson agrees to coach the girls in football, Graham steals a locket and Maria engineers a visit to a new nightclub with Richard.
Ray records Kenny's engagement party using the camcorder: with an ex-girlfriend on the loose, and the party food contaminated by Worcester Sauce, it is far from uneventful!
The Polish lady works out that Frank and Graham have taken her locket and they are expelled. Robyn visits the travellers' camp and meets Mary's father.
Natalie finds Fran's photo (planted to convince Richard that Natasha had a boyfriend) and gives it to Natasha who pretends to know him. Then that boy, Fran's cousin, turns up...
The mystery of Robyn's disappearance is solved, hostilities between Fran and Maria flare up, and Ray accidentally shows the incriminating engagement party video to Kenny's fiancé, Ruth.
Justine spends the weekend at Luke's impressive house in the country and tries to shake off the memories of Liam. Back home, Ruth has vamoosed and Kenny is heartbroken.
Video equipment is stolen from the Media Room and the finger of suspicion points to Mick and Barry. The person who has been posting copies of Natasha's diary is discovered.
Ruth insists on a church wedding, Lauren again gets the blame for Dudley's joke against Mr. Parrott, and Justine and Ray make a surprising discovery about Mr. Brisley.
Mr. Brisley admits to being gay but gets support in an unexpected way, Mr Parrott gets taken down a peg or two, and Jacko tells his friends that his mother is in a mental institution.
When Kenny and Ruth get married it's an opportunity for Grange Hill to dress up. The staff go nowhere fast while Bevis and Mrs. Mason end up helping the police with their inquiries.