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.
2 - 1Planet of Giants Oct. 31, 1964
2 - 2Dangerous Journey Nov. 07, 1964
2 - 3Crisis Nov. 14, 1964
2 - 4World's End Nov. 21, 1964
2 - 5The Daleks Nov. 28, 1964
2 - 6Day of Reckoning Dec. 05, 1964
2 - 7The End of Tomorrow Dec. 12, 1964
2 - 8The Waking Ally Dec. 19, 1964
2 - 9Flashpoint Dec. 26, 1964
2 - 10The Powerful Enemy Jan. 02, 1965
2 - 11Desperate Measures Jan. 09, 1965
2 - 12The Slave Traders Jan. 16, 1965
2 - 13All Roads Lead to Rome Jan. 23, 1965
2 - 14Conspiracy Jan. 30, 1965
2 - 15Inferno Feb. 06, 1965
2 - 16The Web Planet Feb. 13, 1965
2 - 17The Zarbi Feb. 20, 1965
2 - 18Escape to Danger Feb. 27, 1965
2 - 19Crater of Needles Mar. 06, 1965
2 - 20Invasion Mar. 13, 1965- 2 - 21The Centre Mar. 20, 1965
2 - 22The Lion Mar. 27, 1965
2 - 23The Knight of Jaffa Apr. 03, 1965
2 - 24The Wheel of Fortune Apr. 10, 1965
2 - 25The Warlords Apr. 17, 1965
2 - 26The Space Museum Apr. 24, 1965
2 - 27The Dimensions of Time May. 01, 1965
2 - 28The Search May. 08, 1965
2 - 29The Final Phase May. 15, 1965
2 - 30The Executioners May. 22, 1965
2 - 31The Death of Time May. 29, 1965
2 - 32Flight Through Eternity Jun. 05, 1965
2 - 33Journey into Terror Jun. 12, 1965
2 - 34The Death of Doctor Who Jun. 19, 1965
2 - 35The Planet of Decision Jun. 26, 1965
2 - 36The Watcher Jul. 03, 1965
2 - 37The Meddling Monk Jul. 10, 1965
2 - 38A Battle of Wits Jul. 17, 1965
2 - 39Checkmate Jul. 24, 1965