Synopsis
The season featured a story arc involving E-Space and the return of the Master who had stolen a new body rather than regenerate. The stories were darker and more adult in tone than those during the Graham Williams era. They also attempted to emphasise science, much to the satisfaction of both script editor Christopher H. Bidmead and executive producer Barry Letts. Notably, this season revolves around the theme of entropy, linking together all of its stories in a rare phenomenon for the show (while other story arcs would be linked together via people, objects, etc, the use of an overarching theme for a season was unprecedented). This theme would eventually foreshadow and culminate in the Doctor's regeneration at the end of the season.
Season 18 aired between 30 Aug 1980 and 21 Mar 1981, 28 episodes.
Episodes
E01
The Leisure Hive (1)
30 Aug 1980
E02
The Leisure Hive (2)
06 Sep 1980
E03
The Leisure Hive (3)
13 Sep 1980
E04
The Leisure Hive (4)
20 Sep 1980
E05
Meglos (1)
27 Sep 1980
E06
Meglos (2)
04 Oct 1980
E07
Meglos (3)
11 Oct 1980
E08
Meglos (4)
18 Oct 1980
E09
Full Circle (1)
25 Oct 1980
E10
Full Circle (2)
01 Nov 1980
E11
Full Circle (3)
08 Nov 1980
E12
Full Circle (4)
15 Nov 1980
E13
State of Decay (1)
22 Nov 1980
E14
State of Decay (2)
29 Nov 1980
E15
State of Decay (3)
06 Dec 1980
E16
State of Decay (4)
13 Dec 1980
E17
Warriors' Gate (1)
03 Jan 1981
E18
Warriors' Gate (2)
10 Jan 1981
E19
Warriors' Gate (3)
17 Jan 1981
E20
Warriors' Gate (4)
24 Jan 1981
E21
The Keeper of Traken (1)
31 Jan 1981
E22
The Keeper of Traken (2)
07 Feb 1981
E23
The Keeper of Traken (3)
14 Feb 1981
E24
The Keeper of Traken (4)
21 Feb 1981
E25
Logopolis (1)
28 Feb 1981
E26
Logopolis (2)
07 Mar 1981
E27
Logopolis (3)
14 Mar 1981
E28
Logopolis (4)
21 Mar 1981