The 20th season of the British science fiction television series Doctor Who originally aired from January 3 to March 16, 1983, with a total of 22 episodes across 6 stories, plus a special episode aired later in November 1983 titled "The Five Doctors" to celebrate the show's 20th anniversary

. Key details about Doctor Who Season 20:

• Main cast: Peter Davison as the Fifth Doctor; companions included Sarah Sutton as Nyssa, Janet Fielding as Tegan Jovanka, and Mark Strickson as Vislor Turlough (who joined mid-season). The shape-shifting android Kamelion, voiced by Gerald Flood, also appeared

• Notable special: "The Five Doctors" featured the return of past Doctors including the First Doctor (played by Richard Hurndall, replacing the late William Hartnell), Second Doctor (Patrick Troughton), and Third Doctor (Jon Pertwee), alongside the Fifth Doctor. Several past companions also returned for this special

• Production: Produced by John Nathan-Turner with Eric Saward as script editor

Additionally, in 2025, a special episode of Doctor Who: Unleashed aired to celebrate 20 years since the 2005 revival of the series. This special featured interviews with past and current Doctors such as David Tennant, Jodie Whittaker, and Ncuti Gatwa, companions, and showrunners including Russell T Davies, Steven Moffat, and Chris Chibnall. It explored behind-the-scenes stories and the impact of the revival

. In summary, "Doctor Who 20" can refer to the classic 20th season from 1983 starring the Fifth Doctor, or the 20th anniversary of the 2005 revival celebrated with a special Doctor Who: Unleashed episode in 2025.