Season 21

Season 21 of Doctor Who ran from 5 January 1984 to 30 March 1984. It starred Peter Davison as the Fifth Doctor, Janet Fielding as Tegan Jovanka and Mark Strickson as Turlough for the majority, whilst the final serial featured Colin Baker as the Sixth Doctor and Nicola Bryant as Peri Brown. The season opened with Warriors of the Deep and concluded with The Twin Dilemma.

Overview
The season consisted of seven serials comprised of 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. In this case, Janet Fielding, Mark Strickson and Peter Davison, respectively, departed their roles in three consecutive serials.

Cast

 * The Doctor - Peter Davison
 * Tegan Jovanka - Janet Fielding
 * Vislor Turlough - Mark Strickson

Recurring

 * Peri Brown - Nicola Bryant
 * The Doctor - Colin Baker
 * Lytton - Maurice Colbourne
 * Davros - Terry Molloy
 * Dalek Voices - Brian Miller, Royce Mills
 * Kamelion (voice) - Gerald Flood
 * - Anthony Ainley
 * Nyssa - Sarah Sutton
 * Adric - Matthew Waterhouse

Guest

 * Solow - Ingrid Pitt
 * Nilson - Ian McCulloch
 * Vorshak - Tom Adams
 * Bulic - Nigel Humphreys
 * Preston - Tara Ward
 * Icthar - Norman Comer
 * Sauvix - Christopher Farries
 * Jane Hampden - Polly James
 * Sir George Hutchinson - Denis Lill
 * Colonel Wolsey - Glyn Houston
 * Joseph Willow - Jack Galloway
 * Will Chandler - Keith Jayne
 * Andrew Verney - Frederick Hall
 * Brazen - Peter Gilmore
 * Norna - Lesley Dunlop
 * Range - William Lucas
 * Plantagenet - Jeff Rawle
 * Cockerill - Maurice O'Connell
 * Gravis - John Gillett
 * Stien - Rodney Bewes
 * Styles - Rula Lenska
 * Colonel Archer - Del Henney
 * Timanov - Peter Wyngarde
 * Professor Howard Foster - Dallas Adams
 * Sorasta - Barbara Shelley
 * Amyand - James Bate
 * Malkon - Edward Highmore
 * Sharaz Jek - Christopher Gable
 * Morgus - John Normington
 * Salateen - Robert Glenister
 * Stotz - Maurice Roëves
 * Chellak - Michael Cochrane
 * Krelper - Roy Holder
 * Timmin - Barbara Kinghorn
 * President - David Neal
 * Professor Edgworth / Azmael - Maurice Denham
 * Hugo Lang - Kevin McNally
 * Mestor - Edwin Richfield
 * Romulus - Gavin Conrad
 * Remus - Andrew Conrad
 * Noma - Barry Stanton
 * Drak - Oliver Smith

TV

 * The Five Doctors

Novels

 * The Crystal Bucephalus

Short stories
to be added

Audio

 * The Five Companions
 * Fifth Doctor's involvement in The Sirens of Time

Comics
to be added

Novels

 * Deep Blue
 * The King of Terror
 * Lords of the Storm
 * Imperial Moon
 * The Ultimate Treasure
 * Superior Beings
 * Warmonger
 * Blood and Hope

Short stories

 * Life After Queth
 * Perfect Day
 * Keeping It Real
 * The Creation of Camelot
 * Encounter on Burnt Snake Flat
 * Graham Dilley Saves the World
 * The Gangster's Story
 * Far Away in a Manger

Audio

 * And You Will Obey Me
 * Excelis Dawns
 * Time in Office
 * Phantasmagoria
 * Loups-Garoux
 * Singularity
 * The Blazing Hour
 * Fifth Doctor and Turlough's involvement in The End of the Beginning
 * I, Kamelion
 * Red Dawn
 * Exotron
 * Urban Myths
 * The Eye of the Scorpion
 * The Church and the Crown
 * No Place Like Home
 * Nekromanteia
 * The Axis of Insanity
 * The Roof of the World
 * Three's a Crowd
 * The Council of Nicaea
 * The Kingmaker
 * Peri and Erimem's involvement in The Veiled Leopard
 * The Gathering
 * Cuddlesome
 * The Mind's Eye
 * The Fifth Doctor, Peri and Erimem's cameo in The 100 Days of the Doctor
 * Son of the Dragon
 * The Bride of Peladon
 * Mission of the Viyrans
 * The Judgement of Isskar
 * The Destroyer of Delight
 * The Chaos Pool
 * The Garden of Storms
 * The Moonrakers
 * The People Made of Smoke
 * Peri and the Piscon Paradox
 * Winter

Comics

 * The Curse of the Scarab

VHS releases

 * Warriors of the Deep (1995)
 * The Awakening/Frontios (1997)
 * Resurrection of the Daleks (1993/2001)
 * Planet of Fire (1998)
 * The Caves of Androzani (1992)
 * The Twin Dilemma (1992)

DVD & Blu-ray releases
All serials of season 21 were released individually in between 2001 and 2011.

Novels

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

Target Books was originally unable to come to an agreement that would have allowed Resurrection of the Daleks to be adapted as a novel. However, Eric Saward eventually novelised the story in collaboration with BBC Books in 2019, 35 years after the story first premiered on television.