Season 6

The sixth season of Doctor Who ran between 10 August 1968 and 21 June 1969. It featured Patrick Troughton as the Second Doctor.

Overview
Season 6 featured the first ever UNIT story, The Invasion, which showcased the return of Brigadier Lethbridge-Stewart. It also featured the first official appearance of Time Lords and the Doctor's home planet (as yet unnamed). (Another member of Susan and the Doctor's race, the Monk, had appeared previously, but without much elaboration and without using the term "Time Lord".) It also marked the end of the black-and-white era and the tenure of Patrick Troughton as the Second Doctor. It consisted of seven serials and forty-four episodes, including two epic-length storylines: the eight episodes of The Invasion and the ten-episode The War Games. This season is fortunately more complete than the previous three seasons, of which only five serials exist. Seven episodes from this season are lost, although audio recordings remain for all; as a result, the DVD release of The Invasion uses animation to recreate the two missing episodes from that story. Season 6 is also the last season of Doctor Who to contain missing episodes, with all subsequent seasons affected by the then-in effect junking policy restored through various means.

Recurring
Season 6 was the first season since Season 1 in which the core cast remained unchanged for the entire series.
 * The Second Doctor - Patrick Troughton
 * Jamie McCrimmon - Frazer Hines
 * Zoe Heriot - Wendy Padbury
 * Brigadier Lethbridge-Stewart - Nicholas Courtney
 * Corporal Benton - John Levene

Stories set during this season

 * AUDIO: Fear of the Daleks (after The Wheel in Space)
 * Future Imperfect (during Episode 5 The Mind Robber)
 * PROSE: Aliens and Predators (between The Invasion and The Krotons)
 * Involvement in PROSE UPVC (between The Invasion and The Krotons)
 * Involvement in PROSE The Colony of Lies (between The Invasion and The Krotons)
 * PROSE: Foreign Devils (between The Invasion and The Krotons)
 * AUDIO: The Isos Network (between The Invasion and The Krotons)
 * PROSE: Vortex of Fear (between The Seeds of Death and The Space Pirates)
 * PROSE: The Final Sanction (between The Seeds of Death and The Space Pirates)
 * AUDIO: Echoes of Grey (between The Wheel in Space and The Space Pirates)
 * AUDIO: Tales from the Vault (between The Wheel in Space and The Space Pirates)
 * AUDIO: The Memory Cheats (between The Wheel in Space and The Space Pirates)
 * AUDIO: The Jigsaw War (between The Wheel in Space and The Space Pirates)
 * AUDIO: The Uncertainty Principle (between The Wheel in Space and The Space Pirates)
 * PROSE: Please Shut the Gate (between The Seeds of Death and The Space Pirates)
 * PROSE: Constant Companion (between The Seeds of Death and The Space Pirates)
 * PROSE: The Indestructible Man (between The Seeds of Death and The Space Pirates)
 * AUDIO: The Glorious Revolution (after The Seeds of Death)
 * PROSE: The Wheel of Ice (between The Seeds of Death and The Space Pirates)
 * PROSE: The Menagerie (between The Space Pirates and The War Games)
 * PROSE: Fallen Angel (between The Space Pirates and The War Games)
 * Involvement in PROSE: The Eight Doctors (during episode 9 of The War Games)
 * PROSE: War Crimes (during episode 10 of The War Games)

VHS

 * The Dominators (1990)
 * The Mind Robber (1990)
 * The Invasion (with narration of episodes 1 and 4) (1993)
 * The Krotons (1991)
 * The Seeds of Death (1985/1987) (Edited Movie Format)
 * The War Games (1990/2002) (on 2 tapes)
 * The Troughton Years (1991) (The Space Pirates episode 2)

Loose Cannon VHS releases

 * The Invasion (2003) (Episodes 1 and 4 only)
 * The Space Pirates (1998/2007) (Episodes 1, 3-6 only)

Novels

 * The Dominators
 * The Mind Robber
 * The Invasion
 * The Krotons
 * The Seeds of Death
 * The Space Pirates
 * Doctor Who and the War Games

Other information
Novels and other media contend that further adventures of the Second Doctor occurred during Season 6B prior to his regeneration into the Third Doctor as seen in Season 7 of the television series.