Season 21



Season 21 of Doctor Who ran between 5 January 1984 and 30 March 1984. It starred Peter Davison as the Fifth Doctor. The last story, The Twin Dilemma introduced Colin Baker as the Sixth Doctor.

Overview
The season consisted of seven serials and twenty-four episodes. The Twin Dilemma, the first story with Colin Baker as the Sixth Doctor aired last in the season. This season saw the departure of companions Tegan, Turlough and Kamelion and introduced Peri. Most episodes were the traditional twenty-five minute length. However, due to coverage of the 1984 Winter Olympics, Resurrection of the Daleks was re-edited before airing and shown as two forty-five minute episodes.

Colin Baker's first story, The Twin Dilemma, introduced a modified version of the opening credits including a slight modification to the series logo (although the theme arrangement was not changed). This was the first time since Season 4 that such a change occurred during a season.

Along with Season 4, it was one of only two seasons of the classic series to have a completely different cast in the final story of the season than in the first story.

Regulars

 * The Doctor - Peter Davison (Departed The Caves of Androzani)
 * The Doctor - Colin Baker (Introduced The Caves of Androzani)
 * Peri Brown - Nicola Bryant (introduced Planet of Fire)
 * Tegan Jovanka - Janet Fielding (departed Resurrection of the Daleks)
 * Turlough - Mark Strickson (departed Planet of Fire)

Semi-Regulars

 * Kamelion - Gerald Flood
 * The Master - Anthony Ainley

Stories Set During This Season

 * PDA: Deep Blue (between Warriors of the Deep and The Awakening)
 * PDA: The King of Terror (between The Awakening and Frontios)
 * MA: Lords of the Storm (between Resurrection of the Daleks and Planet of Fire)
 * Loups-Garoux (between Resurrection of the Daleks and Planet of Fire)
 * PDA: Imperial Moon (between Resurrection of the Daleks and Planet of Fire)
 * Red Dawn (between Planet of Fire and The Caves of Androzani)
 * PDA: The Ultimate Treasure (between Planet of Fire and The Caves of Androzani)
 * PDA: Superior Beings (between Planet of Fire and The Caves of Androzani)
 * PDA: Warmonger (directly after to Superior Beings)

VHS

 * Warriors of the Deep
 * The Awakening/Frontios
 * Resurrection of the Daleks
 * Planet of Fire
 * The Caves of Androzani
 * The Twin Dilemma

DVDs

 * Warriors of the Deep (2008)
 * The Awakening (2011)
 * Frontios (2011)
 * Resurrection of the Daleks (2002)
 * Resurrection of the Daleks - Special Edition (2011)
 * Planet of Fire (2010)
 * The Caves of Androzani (2001)
 * The Caves of Androzani - Special Edition (2010)
 * The Twin Dilemma (2009)

Novels

 * Warriors of the Deep
 * The Awakening
 * Frontios
 * Planet of Fire
 * The Caves of Androzani
 * The Twin Dilemma