|Country of origin||United Kingdom|
|No. of stories||7|
|No. of episodes||24|
|Original release||5 January –|
30 March 1984
The twenty-first season of British science fiction television series Doctor Who began on 5 January 1984 with the 5th Doctor (Peter Davison) serial Warriors of the Deep, and ended with Colin Baker's first serial The Twin Dilemma. For only the second time (the first being during season 4), the entire TARDIS crew changed over the course of a single season.
See also: List of Doctor Who cast members
Peter Davison makes his final regular appearance as the Doctor in The Caves of Androzani. Colin Baker makes his first full appearance as the Doctor in the final serial The Twin Dilemma.
Janet Fielding (Tegan Jovanka) and Mark Strickson (Vislor Turlough) continue their roles as the Fifth Doctor's companions for their final season, Janet Fielding leaves in Resurrection of the Daleks and Mark Strickson departs in Planet of Fire. New companion Peri Brown played by Nicola Bryant makes her first appearance in Planet of Fire.
The shape-shifting Android Companion Kamelion, played by Gerald Flood, makes his second and final appearance in Planet of Fire, though the character itself – along with other Fifth Doctor companions who left by this story (Tegan, Nyssa, Adric, and Turlough) – all make illusionary cameos as the Doctor regenerates at the climax of The Caves of Androzani.
Anthony Ainley returns in Planet of Fire as the Master, which was intended to be his final appearance. Ainley, like other departed fifth Doctor companions make illusionary cameos as the Doctor regenerates.
Davros makes his first appearance since Destiny of the Daleks (1979) this time played by Terry Molloy.
See also: List of Doctor Who episodes (1963–1989)
Episodes were broadcast twice weekly on Thursday and Friday evenings, with Resurrection of the Daleks broadcast on two consecutive Wednesday nights.
Resurrection of the Daleks was planned as a standard four-parter. However, the BBC's coverage of the 1984 Winter Olympics meant that Doctor Who's normal timeslot was unavailable. Rather than delay broadcasting the story, the decision was taken to produce it as a pair of double length episodes and broadcast it in the unfamiliar Wednesday timeslot.
The Caves of Androzani was the first time since Season 4's The Tenth Planet that the introduction of a new Doctor had taken place before the final serial of the season.
|Serial title||Episode titles||Directed by||Written by||Original air date||Prod.|
|130||1||Warriors of the Deep||"Part One"||Pennant Roberts||Johnny Byrne||5 January 1984||6L||7.6||65|
|"Part Two"||Pennant Roberts||Johnny Byrne||6 January 1984||6L||7.5||64|
|"Part Three"||Pennant Roberts||Johnny Byrne||12 January 1984||6L||7.3||62|
|"Part Four"||Pennant Roberts||Johnny Byrne||13 January 1984||6L||6.6||65|
|The TARDIS materialises in a seabase in the year 2084. Earth in the late 21st century is divided between two power blocs waging a bitter cold war, forever threatening to escalate into violent conflict. Mysterious accidents have been occurring on the seabase, including the deaths of key personnel. Investigating, the Doctor, Tegan and Turlough discover that not only have double agents infiltrated the seabase, but the Doctor's old foes, the Silurians and Sea Devils, are plotting to use the seabase to set off a war which will decimate humanity.|
|131||2||The Awakening||"Part One"||Michael Owen Morris||Eric Pringle||19 January 1984||6M||7.9||65|
|"Part Two"||Michael Owen Morris||Eric Pringle||20 January 1984||6M||6.6||63|
|The Doctor takes Tegan to the village of Little Hodcombe to visit her grandfather. The villagers, led by Sir George Hutchinson, are reenacting events from the English Civil War, including skirmishes which took place near the town. But the recreations have revived the Malus, an alien entity buried beneath a ruined church which feeds on the passions inflamed by war and death. Time is becoming distorted while Hutchinson – who has fallen under the Malus' influence – works to set the creature free, putting Tegan's life at risk in the process.|
|132||3||Frontios||"Part One"||Ron Jones||Christopher H. Bidmead||26 January 1984||6N||8.0||66|
|"Part Two"||Ron Jones||Christopher H. Bidmead||27 January 1984||6N||5.8||69|
|"Part Three"||Ron Jones||Christopher H. Bidmead||2 February 1984||6N||7.8||65|
|"Part Four"||Ron Jones||Christopher H. Bidmead||3 February 1984||6N||5.6||65|
|The TARDIS arrives on the planet Frontios in the far future, where the last vestiges of humanity crashlanded years earlier. The struggling colony is beset by disasters, including deadly meteorite showers and the disappearance of several prominent colonists who have been sucked down beneath the ground. The Doctor, Tegan and Turlough discover that the culprits are the Gravis and his Tractators, giant insects with incredible powers over gravity. The Gravis intends to transform Frontios into an enormous spaceship, and spread the terror of the Tractators across the galaxy.|
|133||4||Resurrection of the Daleks||"Part One"||Matthew Robinson||Eric Saward||8 February 1984||6P||7.3||69|
|"Part Two"||Matthew Robinson||Eric Saward||15 February 1984||6P||8.0||65|
|The Doctor, Tegan and Turlough are nearly torn apart in a Dalek time corridor which connects a warehouse on modern-day Earth with a spacecraft in the future. The Daleks have lost the war with the Movellans due to a virus which affects only their kind. Now, with the help of the mercenary Lytton, they intend to free the imprisoned Davros and force him to create an antidote. Once successful, the Daleks will at last be in a position to destroy the Movellans and rampage across the cosmos.|
|134||5||Planet of Fire||"Part One"||Fiona Cumming||Peter Grimwade||23 February 1984||6Q||7.4||—|
|"Part Two"||Fiona Cumming||Peter Grimwade||24 February 1984||6Q||6.1||—|
|"Part Three"||Fiona Cumming||Peter Grimwade||1 March 1984||6Q||7.4||—|
|"Part Four"||Fiona Cumming||Peter Grimwade||2 March 1984||6Q||7.0||—|
|Turlough rescues a drowning botany student named Peri Brown and brings her to the TARDIS to recuperate. Before Peri can bid her farewells, Kamelion – once again under the Master's control – takes the TARDIS to the planet Sarn. There his mission is to find the Master, who has been diminished to just inches in height following a mishap with his tissue compression eliminator, and restore him using the healing properties of Sarn's miraculous numismaton flames. But Sarn hides a mysterious connection to Turlough's past – a connection which may prove to be the catalyst in the Master's scheme.|
|135||6||The Caves of Androzani||"Part One"||Graeme Harper||Robert Holmes||8 March 1984||6R||6.9||65|
|"Part Two"||Graeme Harper||Robert Holmes||9 March 1984||6R||6.6||—|
|"Part Three"||Graeme Harper||Robert Holmes||15 March 1984||6R||7.8||65|
|"Part Four"||Graeme Harper||Robert Holmes||16 March 1984||6R||7.8||68|
|After landing on the planet Androzani Minor, the Doctor and Peri develop lethal spectrox toxaemia poisoning. As the two search for a cure before it is too late, they become enmeshed in a decades-old feud between the disfigured roboticist Sharaz Jek and businessman Morgus. Jek falls in love with Peri, but the situation only degenerates when the girl rebuffs his affections. Between threats from Magma beasts and gun runners, it quickly becomes apparent that the Doctor will never find a cure in time to save both himself and his companion.|
|136||7||The Twin Dilemma||"Part One"||Peter Moffatt||Anthony Steven||22 March 1984||6S||7.6||61|
|"Part Two"||Peter Moffatt||Anthony Steven||23 March 1984||6S||7.4||66|
|"Part Three"||Peter Moffatt||Anthony Steven||29 March 1984||6S||7.0||59|
|"Part Four"||Peter Moffatt||Anthony Steven||30 March 1984||6S||6.3||67|
|The Doctor experiences serious regenerative instability, causing him to attack Peri and then decide to live as a hermit on the barren asteroid Titan 3. There he stumbles upon a plot by his old friend, the Time Lord Azmael, who has kidnapped twin mathematical geniuses named Romulus and Remus. Azmael's adopted planet, Jaconda, has been taken over by the sluglike Mestor and his Gastropods, forcing the Time Lord to do Mestor's bidding. But even Azmael is unaware of Mestor's true plan – to destroy Jaconda's sun, and thereby scatter Gastropod eggs throughout the universe.|
During this season, the title card was slightly modified for the final serial The Twin Dilemma, and continued during Colin Baker's reign as the Sixth Doctor until the end of the season 23 14 episode epic The Trial of a Time Lord.
The entire season was broadcast from 5 January to 30 March 1984. Transmission moved to Thursdays and Fridays, except for Resurrection of the Daleks which was aired in two double-length episodes on Wednesdays.
|Season||Story no.||Serial name||Number and duration
|UK release date||Australia release date||USA/Canada release date|
|21||130||Warriors of the Deep||4 x 25 mins||September 1995||July 1996||May 1997|
|6 x 25 mins||September 1997
2 x VHS
|March 1998||March 1998|
2 x VHS
|133||Resurrection of the Daleks||4 x 25 mins||November 1993||February 1994||May 1994|
|134||Planet of Fire||4 x 25 mins||September 1998||January 1999||November 1998|
|135||The Caves of Androzani||4 x 25 mins||February 1992||May 1992||October 1992|
|136||The Twin Dilemma||4 x 25 min.||May 1992||May 1993||October 1993|
|Season||Story no.||Serial name||Number and duration
|R2 release date||R4 release date||R1 release date|
|21||130||Warriors of the Deep[a]||4 × 25 min.||14 January 2008||5 March 2008||3 June 2008|
|131||The Awakening[b]||2 × 25 min.||20 June 2011||4 August 2011||12 July 2011|
|132||Frontios||4 × 25 min.||30 May 2011||7 July 2011||14 June 2011|
|133||Resurrection of the Daleks[c]||4 × 25 min.[d]||18 November 2002||30 January 2003||1 July 2003|
|Resurrection of the Daleks (Special Edition)[e]||4 × 25 min.[f]
2 × 46 min.[g]
|28 March 2011||5 May 2011||12 June 2012|
|134||Planet of Fire[h]||4 × 25 min.[i]
1 × 66 min.[j]
|14 June 2010||5 August 2010||7 September 2010|
|135||The Caves of Androzani[k]||4 × 25 min.||18 June 2001||7 January 2002||2 April 2002|
|The Caves of Androzani (Special Edition)[l]||4 × 25 min.||4 October 2010||2 December 2010||14 February 2012|
|136||The Twin Dilemma||4 × 25 min.||7 September 2009||3 December 2009||5 January 2010|
See also: List of Doctor Who novelisations
|Season||Story no.||Library no.[a]||Novelisation title||Author||Hardcover
|21||130||87||Warriors of the Deep||Terrance Dicks||24 May 1984||16 August 1984||5 June 1995 (abridged)|
4 May 2023 (unabridged)
|131||95||The Awakening||Eric Pringle||14 February 1985||13 June 1985||8 July 2010|
|132||91||Frontios||Christopher H. Bidmead||20 September 1984||10 December 1984||2 March 2010[e] |
16 April 2015
|133||N/A||Resurrection of the Daleks||Eric Saward||18 July 2019||11 March 2021||1 August 2019|
|134||93||Planet of Fire||Peter Grimwade||18 October 1984||17 January 1985||N/A|
|135||92||The Caves of Androzani||Terrance Dicks||15 November 1984||14 February 1985||1 November 2018|
|136||103||The Twin Dilemma||Eric Saward||10 October 1985||13 March 1986||5 January 2012|