Season 21



Season 21 of Doctor Who ran between 5th January 1984 and 30th 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 24 episodes. The Twin Dilemma, the first story with Colin Baker as the Sixth Doctor aired last in the season. This season sees the departure of companions Tegan, Turlough and Kamelion and introduces Peri. Most episodes were the traditional 25 minute length, however due to coverage of the 1984 Winter Olympics, Resurrection of the Daleks was re-edited before airing and show as two 45-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.

Regulars

 * The Doctor - Peter Davison
 * Tegan Jovanka - Janet Fielding (departed Resurrection of the Daleks)
 * Turlough - Mark Strickson (departed Planet of Fire)

Semi-Regulars

 * The Doctor - Colin Baker (Introduced The Caves of Androzani)
 * Peri Brown - Nicola Bryant (introduced Planet of Fire)
 * Kamelion - Gerald Flood
 * The Master - Anthony Ainley

VHS

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

DVD

 * Warriors of the Deep
 * Resurrection of the Daleks
 * Planet of Fire
 * The Caves of Androzani
 * The Caves of Androzani - Special Edition
 * The Twin Dilemma

Novels

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