Season 9
It was noted for being the beginning of the end of the Doctor's exile on Earth, with the Doctor's TARDIS still under the control of the Time Lords (The Mutants) and restricted freedom (The Curse of Peladon and The Time Monster), as well as UNIT and the Master appearing less frequently in compared to the previous two series. As well as the return of the Daleks and the Ice Warriors, this series also introduced Alpha Centauri, Aggedor and the Silurians' aquatic cousins the Sea Devils.
Episodes
1 Day of the Daleks (1) Jan 1, 1972 
2 Day of the Daleks (2) Jan 8, 1972 
3 Day of the Daleks (3) Jan 15, 1972 
4 Day of the Daleks (4) Jan 22, 1972 
5 The Curse of Peladon (1) Jan 29, 1972 
6 The Curse of Peladon (2) Feb 5, 1972 
7 The Curse of Peladon (3) Feb 12, 1972 
8 The Curse of Peladon (4) Feb 19, 1972 
9 The Sea Devils (1) Feb 26, 1972 
10 The Sea Devils (2) Mar 4, 1972 
11 The Sea Devils (3) Mar 11, 1972 
12 The Sea Devils (4) Mar 18, 1972 
13 The Sea Devils (5) Mar 25, 1972 
14 The Sea Devils (6) Apr 1, 1972 
15 The Mutants (1) Apr 8, 1972 
16 The Mutants (2) Apr 15, 1972 
17 The Mutants (3) Apr 22, 1972 
18 The Mutants (4) Apr 29, 1972 
19 The Mutants (5) May 6, 1972 
20 The Mutants (6) May 13, 1972 
21 The Time Monster (1) May 20, 1972 
22 The Time Monster (2) May 27, 1972 
23 The Time Monster (3) Jun 3, 1972 
24 The Time Monster (4) Jun 10, 1972 
25 The Time Monster (5) Jun 17, 1972 
26 The Time Monster (6) Jun 24, 1972