Nyssa (Doctor Who)

Nyssa is an aristocrat of Traken, the daughter of Tremas[2] (a consul of the Traken Union) and stepdaughter of Kassia. She aids the Doctor and Adric when the Master wrests control of the Keepership by first manipulating and then murdering her stepmother, but is herself hypnotised and kidnapped by him after he takes control of her father's body. After being freed from the Master's control, she is brought to Logopolis by the Watcher and discovers that Traken has been destroyed[3] as a side effect of the Master's tampering with the Logopolitan's formulae. She subsequently joins Adric and Tegan Jovanka as a companion and member of the TARDIS crew, and witnesses the Fourth Doctor's regeneration into the Fifth.

During her journeys with Tegan and Adric aboard the TARDIS, Nyssa finds herself trapped in a mathematical equation by the Master – whom she hates as he is now using her father's face. She also encounters a race of androids and their insane ruler, helps foil the genocidal plans of a wounded Terileptil and incidentally starts the Great Fire of London, and discovers her uncanny resemblance to a 1920s English socialite Ann Talbot.[4]

Adric's death while battling the Cybermen affects the TARDIS crew deeply. When confronted by an illusion of him created by the Master shortly afterwards, both Nyssa and Tegan are initially taken aback, until Nyssa notices Adric is still wearing his now-destroyed badge. During this adventure, Nyssa also displays a previously unseen psychic ability[5] when she is contacted by the Xeraphin.

After Tegan is accidentally left at Heathrow at the end of the events in Time Flight, Nyssa travels alone with the Doctor for an unspecified period.

Nyssa and the Doctor are reunited with Tegan while fighting Omega in Amsterdam and on Gallifrey. Later, they help Tegan battle her inner demons (personified by the Mara), and in the events of Mawdryn Undead they meet the Doctor's old friend and ally Brigadier Lethbridge-Stewart. It is during this adventure that the TARDIS crew adopts Turlough, an alien posing as a pupil at an English boarding school, who has secretly entered into a bargain with the Black Guardian to assassinate the Doctor. His interference with the TARDIS infrastructure destabilises it and it locks onto a seemingly derelict space station, Terminus, separating Nyssa from the others. Nyssa's adventures with the Doctor come to an end here, as – to Tegan's horror – she elects to stay to help free the enslaved guards and turn the station into a real hospital. The Doctor is moved by this noble gesture and parts saying that he thinks she is very brave.[6] Nyssa's deep affection for the Doctor is demonstrated at this point when she kisses the Doctor goodbye.

The Fifth Doctor hallucinates Nyssa warning him not to die during his regeneration at the end of The Caves of Androzani and the character appears alongside the Fifth Doctor and Peri Brown in the 1993 charity special Dimensions in Time.

Nyssa is last mentioned by the Tenth Doctor in the 2007 Children in Need episode "Time Crash"[7] when he asks his Fifth incarnation where he is in his own relative timeline.

A 2020 short published to the official Doctor Who YouTube channel and titled Farewell, Sarah Jane, written by former Doctor Who showrunner Russell T. Davies, revealed that Nyssa was in a relationship with fellow traveler Tegan Jovanka.[8]

Although Nyssa's fate after the TARDIS is not certain, the spin-off novel Asylum by Peter Darvill-Evans, relates that she left Terminus and settled down as an academic in a university on an unspecified planet. In Asylum, Nyssa encounters the Fourth Doctor from a time before he met her while he is investigating a historical anomaly. This meeting leaves the Doctor with the knowledge that he will have to be extremely careful dealing with Nyssa when he eventually meets her younger self to avoid changing history.

Since then Nyssa has appeared in several audio plays, still voiced by Sarah Sutton alongside Peter Davison as the Fifth Doctor, produced by Big Finish Productions. Primeval, set in Traken's past, provides an explanation for Nyssa's sudden collapse at the end of Four to Doomsday and her apparent development of psychic abilities in Time-Flight, as she was manipulated by an ancient entity that ruled Traken in the distant past as part of a complex plan to trick the Doctor into giving him access to the Source. Other stories in this time frame include new temporary companions Thomas Brewster and Hannah Bartholemew. The 'Winter' segment of Circular Time, by Paul Cornell and Mike Maddox, is set some years after Asylum and shows her with a husband, Lasarti, and a baby daughter, Nica. In Heroes of Sontar, Nyssa tells Tegan that she has two children named Adric and Tegan (although it is later confirmed that she mis-identified her daughter's name as she was delirious due to infection with a biological weapon).

When she sees the regenerating Fifth Doctor in her dreams and believes this may be the last time she sees him, Nyssa accepts that he is still travelling and having adventures somewhere. However, fifty years after leaving them, Nyssa meets the Doctor, Tegan and Turlough (a short while after they left her from their perspective) in Cobwebs. She begins travelling with them again to research a cure for a lethal plague, which was deliberately engineered to be more dangerous so that a corporation could provide the engineered cure; a chain of events leave Nyssa with a valid sample of the cure for the virus in its early stages, but this sample will not treat the mutated strain that is currently active in her time over twenty years later. In the course of her travels Nyssa is physically de-aged back to the same age she was when she originally left the crew (The Emerald Tiger). In Prisoners of Fate, the TARDIS is drawn to a planet where the Doctor's original TARDIS (the Type 50 he owned on Gallifrey before he stole the familiar Type 40 on impulse to leave the planet) has crash-landed, and the crew end up meeting Nyssa's son, Adric, over two decades after Nyssa resumed her travels with the Doctor, preventing her from simply picking up her life once again now that she knows she didn't go back. Nyssa and her son are able to combine their research to cure the plague, with Nyssa's cure for the original disease being mapped onto the research Adric has undertaken of how the virus subsequently mutated, but Nyssa is prevented from reuniting with Adric when the TARDIS is caught in a CVE while en route to the next planet and is sent back to E-space. Nyssa ultimately sacrifices her own chance to escape so that her fellow travelers can return home, remaining in E-Space to power the equipment needed to open a final portal back to N-Space that the TARDIS can travel through. The audio ends with Nyssa, now an old woman, tending a garden in E-Space after spending the last decade teaching others how to treat the sick, observing that E-Space is showing new signs of life after the Doctor expressed concern that this world would only have a few centuries of life left.

Nyssa appears in the Short Trips audio "A Heart on Both Sides", where she is depicted running a medical ship during the Time War, unknowingly aided in her efforts by the Eighth Doctor (who assists Nyssa under the alias of 'Doctor Foster' to avert a rumour he heard in the future of a ship matching the description of Nyssa's being destroyed).

• Nyssa on Tardis at Fandom, an external wiki
• Nyssa on the BBC's Doctor Who website