
The eighteenth season of Doctor Who ran between 30th August 1980 and 21st March 1981. From Full Circle onwards, the season featured a story arc involving E-Space and the return of the Master. It was the last season to feature Tom Baker as the Fourth Doctor; it also saw the departure of Romana and K-9. It was the first season produced by John Nathan-Turner, who instituted a number of changes: the stories became darker and more adult in tone, the 1966 Delia Derbyshire arrangement of the "Doctor Who theme" was retired in favour of a new arrangement, and a new series logo was introduced. It consisted of 7 stories and 28 episodes. It was the last season of the original series to have a fall-to-spring broadcast schedule and the last to have a fall start until Season 23. After this season, the number of episodes per season began decreasing.
Contents |
| # | Title | Writer | Episodes | Notes |
| 1 | The Leisure Hive | David Fisher | 4 | |
| 2 | Meglos | John Flanagan Andrew McCulloch |
4 | |
| 3 | Full Circle | Andrew Smith | 4 | First appearance of Adric |
| 4 | State of Decay | Terrance Dicks | 4 | |
| 5 | Warriors' Gate | Steve Gallagher | 4 | Final appearances of Romana and K-9 Mk. II |
| 6 | The Keeper of Traken | Johnny Byrne | 4 | First appearance of Nyssa; first appearance of Anthony Ainley as the Master |
| 7 | Logopolis | Christopher H. Bidmead | 4 | Final appearance of the Fourth Doctor and introduction of the Fifth Doctor. First appearance of Tegan Jovanka |
Nyssa does not join as a companion until Logopolis.
| Doctor Who by season/series |
|---|
| Classic Series: 1 • 2 • 3 • 4 • 5 • 6 • 7 • 8 • 9 • 10 • 11 • 12 • 13 • 14 • 15 • 16 • 17 • 18 • 19 • 20 • 21 • 22 • 23 • 24 • 25 • 26 |
| 1996 movie |
| New Series: 1 • 2 • 3 • 4 • 2009 Specials • 5 |
| Season 18 |
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| The Leisure Hive • Meglos • Full Circle • State of Decay • Warriors' Gate • The Keeper of Traken • Logopolis |
| Aliens and Enemies of Season 18 |
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| The Leisure Hive: Pangol • Foamasi • Argolins • West Lodge • Brock • Klout Meglos: Meglos • Grugger • Gaztaks • Tigellans Full Circle: Marshmen • Alzarians • Alzarian spiders State of Decay: Great Vampires • Three Who Rule • Zargo • Camilla • Aukon Warriors' Gate: Rorvik • Tharils • Gundans • Packard • Lane • Aldo • Royce • Biroc • Sagan The Keeper of Traken: Melkur • The Master • Trakenites Logopolis: The Master • Logopolitans |

Sesame Street Season 18 aired from November 17, 1986 to 1987.
Episodes 2226 - 2355 (130 episodes)
Muppet Characters
Other Characters
| Previous season: | Next season: |
| Season 17 (1985-1986) | Season 19 (1987-1988) |
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