 It s the start of a new school year, but radio reports seem to indicate an early end to life on the planet, with an impending asteroid strike - at 3.20pm! Nick and Richard turn up at Ray s house, and find women s clothes - could Ray have a secret girlfriend? There s a bit of a love triangle: Maria fancies Richard who likes Natasha who is not interested. Fran thinks that if they find Natasha someone else, it would leave the way clear - perhaps Mr. Brisley, who she seems to like. Fran and Maria write a letter to the teacher, on pink paper, and Maria puts it in the Staff Room. Unfortunately, they are not sure of his first name.. is it "Geoff"? Techno s excuse that the asteroid caused his homework to catch fire doesn t go down too well. The new caretaker, Dave, doesn t seem very good at DIY, destroying a bookshelf in the Staff Room with one touch of his well-intentioned hammer, and causing the kettle to explode. Mrs. Keele finds one of Mrs. Monroe s classes unsupervised, and goes looking for the errant teacher. For her part, Mrs. Monroe finds her classroom empty... her pupils are tracked down to the Art Room. It seems Mrs. Monroe has started the day firmly convinced it is Monday... whereas it is in fact, Tuesday. When the power goes off too, it seems the asteroid might be to blame after all - or it could be the misplaced enthusiasm of the caretaker. Mr. Hankin, too, seems flustered and unwell and runs off. He tells Mr. Robson that he thinks one of the girls has developed a crush on him - Natasha! He shows him the note Fran and Maria wrote, intended for Mr. Brisley (Mr. Hankin s first name is Geoff). Mr. Robson calls in Natasha, but she doesn t know what he s talking about. Mr. Hankin s experiments with his Year Eight class seem to be "asteroided" too. Natasha works out who wrote the love letter, and pours pink paint on Fran s painting in Art. Fran and Maria puzzle over how Mr. Hankin ended up with the note. 3.20pm approaches, and the Grange Hill occupants look nervously at clocks and watches. The deadline expires, and Mr. Hankin tells his science class they are a silly bunch. But there is an asteroid strike after all - on the computer screen, courtesy of Techno s programming skills!