
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.
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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.
| # | Title | Writer | Episodes | Notes |
| 1 | Warriors of the Deep | Johnny Byrne | 4 | |
| 2 | The Awakening | Eric Pringle | 2 | |
| 3 | Frontios | Christopher H. Bidmead | 4 | |
| 4 | Resurrection of the Daleks | Eric Saward | 2 | Final appearance of Tegan Jovanka. First story broadcast in 45-minute episodes |
| 5 | Planet of Fire | Peter Grimwade | 4 | First appearance of Peri Brown and final appearances of Vislor Turlough and Kamelion |
| 6 | The Caves of Androzani | Robert Holmes | 4 | First appearance of the Sixth Doctor and final appearance of the Fifth Doctor |
| 7 | The Twin Dilemma | Anthony Steven | 4 |
| Doctor Who by season/series |
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| Classic Series: 1 • 2 • 3 • 4 • 5 • 6 • 7 • 8 • 9 • 10 • 11 • 12 • 13 • 14 • 15 • 16 • 17 • 18 • 19 • 20 • 21 • 22 • 23 • 24 • 25 • 26 |
| 1996 movie |
| New Series: 1 • 2 • 3 • 4 • 2009 Specials • 5 |
| Season 21 |
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| Warriors of the Deep • The Awakening • Frontios • Resurrection of the Daleks • Planet of Fire • The Caves of Androzani • The Twin Dilemma |
| Aliens and Enemies of Season 21 |
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| Warriors of the Deep: Silurians • Icthar • Scibus • Tarpok • Sea Devils • Myrka The Awakening: Malus • George Hutchinson Frontios: Gravis • Tractators Resurrection of the Daleks: Davros • Gustave Lytton • Daleks • Dalek Troopers • Dalek Duplicates Planet of Fire: Kamelion • Timanov • The Master The Caves of Androzani: Sharaz Jek • Morgus • Stotz The Twin Dilemma: Jacondans • Mestor • Gastropods |
Sesame Street Season 21 aired from 1989 to 1990.
Episodes 2616 - 2745 (130 episodes)
Muppet Characters
Human Characters
| Previous season: | Next season: |
| Season 20 (1988-1989) | Season 22 (1990-1991) |
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