Within the series' narrative, the Doctor is a centuries-old alien Time Lord from the planet Gallifrey who travels in time and space in the TARDIS, frequently with companions. At the end of life, the Doctor regenerates; as a result, the physical appearance and personality of the Doctor changes. Preceded in regeneration by the Fourth Doctor (Tom Baker), he is followed by the Sixth Doctor (Colin Baker).

Davison portrays the Fifth Doctor as having a vulnerable side and a tendency towards indecisiveness, dressed as a boyish Edwardian cricketer. He travelled with a host of companions, including boy genius Adric (Matthew Waterhouse), alien aristocrat Nyssa (Sarah Sutton) and Australian flight attendant Tegan Jovanka (Janet Fielding), who had travelled with his previous incarnation. He also shared later adventures alongside devious schoolboy Vislor Turlough (Mark Strickson) and American college student Peri Brown (Nicola Bryant).[4]

Overview

After Tom Baker, the Fourth Doctor, and the BBC had announced that he was leaving the role, the show's producers decided that the next Doctor was to be played by someone who presented something of a physical contrast to Baker and by an actor who was already firmly established in the British public's mind. Peter Davison was chosen due to his critically acclaimed role as Tristan Farnon in the BBC series All Creatures Great and Small which had Doctor Who producer John Nathan-Turner as line producer.[5]

The Fifth Doctor's era was notable for a "back to the basics" attitude, in which "silly" humour (and, to an extent, horror) was kept to a minimum, and more scientific accuracy was encouraged by the producer, John Nathan-Turner. It was, at times, a darker and grittier series, in part for seeing the death of one of his companions, Adric. It was also notable for the reintroduction of many of the Time Lord's enemies, such as the Master, Cybermen, Omega, the Black and White Guardians, and the Silurians.[6]

Biography

The Fourth Doctor was seriously injured after falling off the Pharos Project Radio Telescope so he merged with a future incarnation of himself called the Watcher and regenerated into his new youthful fifth incarnation. The regeneration was difficult, and nearly failed, with the Doctor briefly taking on personality aspects from his four previous incarnations. After recovering in the fictional city Castrovalva (actually an elaborate trap created by his arch-enemy the Master), he continued his travels with Adric, Tegan Jovanka and Nyssa. Initially his travels centred on getting Tegan back to Heathrow Airport in time for her first day as an airhostess, but the TARDIS repeatedly missed this destination and Tegan eventually decided to stay in the TARDIS. After trips to the future and the past encountering villains such as Monarch and the Mara, the Fifth Doctor was confronted with tragedy when Adric died trying to stop a space freighter from crashing into prehistoric Earth (Earthshock).[4]

Following Adric's death, the TARDIS accidentally arrived at Heathrow airport (Time-Flight). Here the Doctor and Nyssa left Tegan assuming she would want to stay (when in fact she did not any more). The Doctor and Nyssa then travelled together for an unspecified amount of time before the renegade Time Lord Omega, attempting to return to the universe, temporally bonded himself to the Doctor (Arc of Infinity). Faced with this threat, the Time Lords were forced to attempt executing the Doctor, but he eventually tracked Omega to Amsterdam where he defeated him and re-encountered Tegan (who having now lost her job, had no second thoughts about rejoining the TARDIS crew).

When the Doctor met a new companion, an alien boy stranded on Earth by the name of Vislor Turlough, he did not know that Turlough had been commissioned by the Black Guardian to kill him. Soon after, Nyssa left to help cure Lazar's Disease on the space station Terminus. After meeting the entities known as Eternals racing in yacht-like spacecraft for the prize of "Enlightenment", Turlough broke free from the Black Guardian's influence, and continued to travel with the Doctor and Tegan. Landing in the reign of King John (The King's Demons), the crew again encountered the Master, who was using a shape-shifting robot Kamelion to impersonate the King. However, the Doctor helped Kamelion to regain his free will and the robot joined him in his travels (although he rarely left the TARDIS). The Doctor met three of his previous incarnations when they were summoned to the Death Zone on Gallifrey by president Borusa, who was attempting to gain Rassilon's secret of immortality.

After further adventures in which the Doctor re-encountered old foes, including the Silurians and the Sea Devils (Warriors of the Deep), both Tegan and Turlough left the TARDIS. Tegan would find the death and violence they encountered on their travels too much to bear (Resurrection of the Daleks), and Turlough returned to his home planet of Trion in the company of his younger brother, as well as other exiles of Trion, from the planet Sarn. The Doctor was eventually forced to destroy Kamelion, when the Master used his mental connection to the robot to regain control of him, a process the robot realised was irreversible (Planet of Fire).

Ultimately (The Caves of Androzani), the Fifth Doctor and his last companion Peri Brown were exposed to the drug spectrox in its deadly toxic raw form on Androzani Minor. With only one dose of the antidote available, he nobly sacrificed his own existence to save Peri, expressing doubt for the first time that regeneration might be possible this time, then regenerating into the Sixth Doctor.

Castrovalva is the first serial of the 19th season of the British science fiction television series Doctor Who, which was first broadcast in four twice-weekly parts on BBC1 from 4 to 12 January 1982. It was the first full serial to feature Peter Davison as the Fifth Doctor. The title is a reference to the lithograph Castrovalva by M. C. Escher, which depicts the town Castrovalva in the Abruzzo region, Italy.[citation needed]

In the serial, the alien time traveller the Doctor is led into a trap when his arch-enemy the Master (Anthony Ainley) uses the mathematical abilities of the Doctor's travelling companion Adric (Matthew Waterhouse) to create Castrovalva, a town whose dimensions fold in on itself.

This was the first Doctor Who story not to air on Saturday nights. With Peter Davison taking over as the Doctor, the BBC chose to move the show from its usual Saturday night slot, where it had been since its launch in November 1963. For this new Doctor Who series, the show moved to airing two new episodes per week, on a weeknight prime time slot instead. For Castrovalva, it aired new episodes on a Monday and Tuesday evening.[2]

Plot

After his regeneration at the end of Logopolis, the Fifth Doctor is still weak, and his companions, Adric, Nyssa, and Tegan take him to his TARDIS. Inside, the Doctor is delirious but asks to be taken to the "Zero Room" that contains Time Lord healing technology to allow him to recover.

Tegan and Nyssa discover a terminal on the TARDIS that describes how to use the machine. They attempt to pilot the TARDIS but find they are travelling rapidly to a preset time and destination, "Event One", the Big Bang, a trap set by the Master. After they are unable to find Adric, the women manage to bring the Doctor to the console room in time for him to jettison a quarter of the TARDIS' mass to propel them back to conventional time. They soon discover that the Zero Room was part of the jettisoned mass, so with the help of Nyssa the Doctor builds a temporary coffin-shaped zero cabinet from the zero room's doors. Tegan discovers information on the town of Castrovalva, an ideal place for the Doctor to recover, and directs the TARDIS there.

In the forest, Nyssa and Tegan have difficulties in transporting the Doctor, and become separated from him; the Doctor is captured by warriors protecting Castrovalva, while the women are forced to climb a rocky cliff to reach its entrance. The Doctor is cared for by Shardovan, a librarian, and the elderly Portreeve, before Nyssa and Tegan arrive. After a night's sleep, they discover strange aspects of Castrovalva; if they go out of the town through any of its exits, they find themselves in a particular plaza in the town, and a tapestry in the Doctor's rooms changes and reflects events of the outside world. The Doctor understands that they are trapped in a "recursive occlusion", and Castrovalva is fake. The Portreeve reveals himself as the Master, and shows them the trapped Adric. The Master has been able to use Adric's mathematical genius to create Castrovalva as well as alter the TARDIS, creating the terminal on the console that led them here. Realising the true nature of Castrovalva's reality, Shardovan swings from a chandelier into the web and destroys it, freeing Adric and causing Castrovalva to fall apart. Seeing all is lost, the Master flees to his TARDIS. The Doctor and his companions flee from the town. The Master appears to be trapped and is unable to escape as the town collapses in on itself. As the time travellers return to the TARDIS, the Doctor indicates that he has fully recovered from his regeneration ordeal.