Mr. Griffiths takes Helen and Ziggy to the donkey sanctuary and lets them into a secret.

Calley and Ronnie use their secret language, Vince shows Hollo a secret room, and Mr. Griffiths prepares for 'Operation Harriet'.

Operation Harriet seems to be successful, but the arrival of the donkey has not gone unnoticed. Radio Grange Hill gains support from the staff.

Roland negotiates with Mr. Griffiths for a larger common room, and more and more people are finding out about Harriet.

Imelda reveals the secret of Harriet to Mrs. McClusky, and Zammo gets back together with Jackie.

Ziggy and Robbie cause chaos while fetching a reel of cable, and Danny Kendall's father visits the school. Imelda lets Harriet loose, and she damages two cars.

Vince and Hollo propose that the bottle day money is put towards helping Danny Kendall, and Radio Grange Hill gets a test run.

Fundraising meetings are held. Imelda gets into a fight with Ronnie and Hollo is surprised to learn that Gonch has been dating Ronnie.

Imelda finally takes her stubbornness too far, Gonch returns, and Jackie decides she'll forgo the barge trip and go with Zammo instead.

It's the day of the barge trip. Who is the shadowy figure lurking in the bushes? Is there enough room on the barge to hold Fred's enormous wardrobe, and ego?

More adventures on the Grand Union Canal, and Ant Jones gets sent home.

Interviews are recorded for the radio. Mrs. Reagan isn't pleased to see her daughter riding pillion on Banksie's motorbike.

Can Ziggy conquer his fear of heights to erect the banner? Jackie comes to school with an engagement ring.

Gonch takes Harriet out for donkey rides in the park, and Cleaver wrecks the secret den.

Banksie changes his mind about his work experience after meeting Lucy and Perry. Harriet the donkey falls sick.

Gonch convinces Trevor that the school is haunted. A teacher-student meeting ends abruptly when all of the students' ideas are summarily rejected.

The 6th form get their exam results, Trevor has a meeting with the 'Grange Hill Ghost' and Ant Jones can't please either his own St Joseph's team or his old Grange Hill friends.

Julia starts spying for her father, and the school handbook continues to be misinterpreted as a protest.

Helen and Georgina bid Harriet farewell, Zammo and Jackie go shopping for wedding outfits, and Fay has an unexpected encounter at the craft fair.

Mrs. McClusky is angry at Mr. Bronson for the rulebook, Danny Kendall's return sparks a new feud with St Joseph, and Trevor finally pushes Mr. Scott too far.

Radio Grange Hill stages a sit-in protest. Jackie and Zammo begin to have second thoughts about their marriage.

Trevor Cleaver gets his comeuppance when he participates in an exorcism of the Grange Hill Ghost.

After the staff versus pupils cricket match, Zammo and Jackie make a surprise announcement.