Season 2
Milestones this season included not one but two encore appearances by the Daleks; the departure of the original three companions, Susan Foreman, Barbara Wright and Ian Chesterton; and the first appearance of someone else from the Doctor and Susan's home planet, and the first Time Lord enemy to appear.
Episodes
1 Planet of Giants Oct 31, 1964
2 Dangerous Journey Nov 7, 1964
3 Crisis Nov 14, 1964
4 World's End Nov 21, 1964
5 The Daleks Nov 28, 1964
6 Day of Reckoning Dec 5, 1964
7 The End of Tomorrow Dec 12, 1964
8 The Waking Ally Dec 19, 1964
9 Flashpoint Dec 26, 1964
10 The Powerful Enemy Jan 2, 1965
11 Desperate Measures Jan 9, 1965
12 The Slave Traders Jan 16, 1965
13 All Roads Lead to Rome Jan 23, 1965
14 Conspiracy Jan 30, 1965
15 Inferno Feb 6, 1965
16 The Web Planet Feb 13, 1965
17 The Zarbi Feb 20, 1965
18 Escape to Danger Feb 27, 1965
19 Crater of Needles Mar 6, 1965
20 Invasion Mar 13, 1965
21 The Centre Mar 20, 1965
22 The Lion Mar 27, 1965
23 The Knight of Jaffa Apr 3, 1965
24 The Wheel of Fortune Apr 10, 1965
25 The Warlords Apr 17, 1965
26 The Space Museum Apr 24, 1965
27 The Dimensions of Time May 1, 1965
28 The Search May 8, 1965
29 The Final Phase May 15, 1965
30 The Executioners May 22, 1965
31 The Death of Time May 29, 1965
32 Flight Through Eternity Jun 5, 1965
33 Journey into Terror Jun 12, 1965
34 The Death of Doctor Who Jun 19, 1965
35 The Planet of Decision Jun 26, 1965
36 The Watcher Jul 3, 1965
37 The Meddling Monk Jul 10, 1965
38 A Battle of Wits Jul 17, 1965
39 Checkmate Jul 24, 1965