Series 3 is still set in Letsby Avenue junior school, but Mrs Trout was fired halfway through the series and Miss Moon became the new temporary headmistress until Mrs Bogart (Mrs Trout's sister) took over as headmistress, when Mrs Trout became a school governor. Like the previous series, Badger's presence was knowledge to everyone in the school except the school teaching staff. From this series, the closing credits were edited down to contain only one verse of the theme song. This practice of edited down credits was to continue until the end of the series, with new surrounding graphics for series 9. The repeats of clips featuring characters for the actor credits continued, however, the specially-shot clip of Badger over the technical crew credits was gone, the number of credited technical crew roles having been dramatically reduced, so this portion of the end credits consisted entirely of random clips from earlier in the episode (in chronological order).

The first ten episodes of this 12 episode series were repeated on consecutive Tuesdays from 6 April to 8 June 1993 at 4:05pm on BBC1. The repeat run was not completed owing to shortening of the afternoon CBBC strand in subsequent weeks for Wimbledon and other various sporting events and there being no available slots in the weeks after those.

Mr Valentino, the chairman of the school's Governors, has dinner with Mrs Trout who gets a rubber bottom.

Mrs Trout writes, directs and stars in the school play, "William Tell". But will everything be all right on the night? Not likely with Bodger and Badger about.

Badger decides to enter Mrs Trout's poetry competition.

Mr Valentino decides to award Miss Moon a golden alarm clock for not missing a day's school. Mrs Trout is not happy.

Miss Moon gets a thump on the head and a new view of life. Badger shows her that mash potato is fun to play with.

As Mrs Trout has been sent back to teacher training college to learn how to read, the new headmistress Mrs Bogart arrives. She brings along her loathsome nephew, Eamon, to replace Bodger as the school handyman, so Badger and the children try to scare him off.

A new communication system is set up in the school and Badger makes a mashed potato gun.

From this episode this series moved to 3:50pm on original transmission.

Mrs Bogart is determined to make Class 4 sit a difficult test. However, with so many interruptions (mostly from Bodger who is trying to have a fire drill), will it ever happen?

Mrs Bogart will stop at nothing to get hold of Bodger's competition winnings, even posing as her own hard-up identical twin sister!

Miss Moon has agreed to look after her neighbour's baby for the day. Badger, Rocky and Vicky trick Mrs Bogart into eating laxative chocolate.

Mrs Bogart is charging for lost property and keeps stealing the children's possessions to top up on takings. Badger does what he can to stop her.

Badger is having a bath because it's time for the class photograph. When the photographer is cancelled, Miss Moon asks Bodger to help out.