Season 4 Episode 1: Danger
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Season 1 Episodes
| 1: Unaired pilot | 2: Astronomy | 3: Aquatic Animals |
| 4: Atoms | 5: Advertising | 6: Antidotes |
| 7: Arthropods | 8: Albania | 9: Africa |
| 10: Alan | 11: Arts | 12: Advent |
| 13: Season 1, Episode 13 |
Season 2 Episodes
| 1: Blue | 2: Birds | 3: Bombs |
| 4: Bible | 5: Bears | 6: Beavers |
| 7: Biscuits | 8: Bees | 9: Bats |
| 10: Bills | 11: Beats |
Season 3 Episodes
| 1: Campanology | 2: Cummingtonite | 3: Common Knowledge |
| 4: Cheating | 5: Cat's Eyes | 6: Cockney Rhyming Slang |
| 8: Corby | 9: Creatures | 10: Cleve Crudgington |
| 11: Carnival | 12: Combustion |
Season 4 Episodes
Season 5 Episodes
| 2: Electricity | 3: Eating | 4: Exploration |
| 5: Europe | 6: Everything, Etc. | 7: Espionage |
| 8: Eyes and Ears | 9: Entertainment - Childr | 10: England |
| 11: Endings | 13: Elephants - Compilati |
Season 6 Episodes
| 1: Families - Children in | 2: Fire and Freezing - Ch | 3: Flotsam and Jetsam |
| 4: Fight Or Flight | 6: Fakes and Forgeries | 7: Fingers and Fumbs |
| 8: Fashion | 9: The Future | 10: Flora and Fauna |
| 11: Films and Fame |
Season 7 Episodes
| 1: Gardens | 4: Geography | 5: Groovy (Christmas spec |
| 6: Genius | 9: Gallimaufrey | 10: Greats |
| 11: Gifts |
