The Master's TARDIS was the TARDIS used by the renegade Time Lord known as the Master. He owned more than one TARDIS throughout his many engagements with the Doctor. (PROSE: The Eight Doctors)
History
The Master's first known TARDIS was a Type 45. (PROSE: The Dark Path) During his Earth-based vendetta against the Third Doctor and UNIT, the Master used a TARDIS with a Mark II dematerialisation circuit. Unlike the Doctor's TARDIS, the Master's had a fully functioning chameleon circuit. (TV: Terror of the Autons)
The Decayed Master stole Chancellor Goth's TARDIS after he had killed him, which he still owned before the outbreak of the Last Great Time War, using it to break into Tersurus. (AUDIO: UNIT: Dominion)
On Traken, his TARDIS disguised itself as a Melkur. Although this one was destroyed, he kept another TARDIS within the first, disguised as a grandfather clock, and used it to escape after he stole the body of Tremas. (TV: The Keeper of Traken)
The Master sent his TARDIS to wait for him in the Time Vortex when he prepared to steal the Doctor's body. (PROSE: The Eight Doctors) It is unknown if he ever reclaimed it following his resurrection, as he later fought in the Last Great Time War and fled to hide at the end of the universe. When his memory of his real identity was restored, he used the Doctor's TARDIS to leave, but this may have been out of a lack of opportunity to recover his own ship rather than him not having a TARDIS on that planet. (TV: Utopia, The Sound of Drums)
When the Master later regenerated into a female incarnation who dubbed herself "Missy", she had access to a TARDIS, using it to travel through time and harvest recently deceased human minds for as long as humanity had a concept of the afterlife. (TV: Death in Heaven)
Exterior
The Master's TARDIS in the form of the police box on the Barnet bypass. (TV: Logopolis)
During his rivalry with the Doctor, the Master changed his TARDIS into several different forms, including: an Adjudication flyer, an out-of-date space locker, (PROSE: The Dark Path) a horsebox, (TV: Terror of the Autons) a white cube, (TV: The Claws of Axos) a spaceship, (TV: Colony in Space) a black Rolls-Royce limousine with darkened windows, (PROSE: The Face of the Enemy) a bulkhead door aboard the HMS Redoubt, (PROSE: The Face of the Enemy) the Stone of Sacrifice in the cavern of the church at Devil's End, (PROSE: The Face of the Enemy, The Eight Doctors) a computer bank, (TV: The Time Monster) a filing cabinet, (PROSE: The Touch of the Nurazh) a control panel, (PROSE: Legacy of the Daleks) a wardrobe, (PROSE: Legacy of the Daleks) a grandfather clock, (TV: The Deadly Assassin, The Keeper of Traken, PROSE: The Eight Doctors, AUDIO: Mastermind) a tank, (AUDIO: The Light at the End) a red pillar box, (AUDIO: The Light at the End) the Melkur, (TV: The Keeper of Traken) a police box, (TV: Logopolis, PROSE: The Quantum Archangel, AUDIO: UNIT: Dominion) a laurel bush, (TV: Logopolis) a Doric column, (TV: Logopolis, Castrovalva, Time-Flight, AUDIO: Dust Breeding) a marble fireplace, (TV: Castrovalva) Speedbird Concorde 192, (TV: Time-Flight) an iron maiden, (TV: The King's Demons) a three-sided column, (TV: Planet of Fire) a wooden beach hut, a statue of Queen Victoria, (TV: The Ultimate Foe) a red telephone box, (AUDIO: Eyes of the Master) a transport crate (AUDIO: The Death of Hope), a palm tree, (AUDIO: Rule of the Eminence) and a white pillar. (COMIC: Outrun, The Judas Goatee)
On Traken, the Master disguised a TARDIS as the Melkur. In this form, it was shown to be able to walk and could fire sonic beams from its eyes. When this TARDIS was destroyed, he fled in another he had kept in the former. This TARDIS was disguised as a grandfather clock. (TV: The Keeper of Traken)
While preparing a trap for the Fourth Doctor, the Master temporarily changed his ship into a police box. He later hid it inside the Cloister room as a laurel bush and finally as a stunted, brown Doric column. (TV: Logopolis) He tended to use a column as his TARDIS' "default" exterior. (TV: Castrovalva, Time-Flight, Planet of Fire)
X-rays bounced off the TARDIS exterior, unable to penetrate it. (AUDIO: Mastermind)
Interior
Kamelion (in the form of the Master) in the Master's TARDIS with Peri Brown. (TV: Planet of Fire)
The Master's TARDIS had a varied interior. Some interiors seemed to mimic the Doctor's re-designs of his own TARDIS at the time of the encounter. (TV: The Time Monster, Planet of Fire)
Much of the time, the interior was simply a sombre, black version of the interior of the Doctor's TARDIS, sometimes with special equipment such as the Hadron web which he used to hold Adric captive. (TV: Castrovalva)
Companions who spent time in the Master's TARDIS after spending time in the Doctor's ship noted that the atmosphere of the Master's TARDIS was far less welcoming than that of the Doctor's ship, as though both TARDISes had adapted to the moods of their owners (PROSE: The Quantum Archangel).
The Master's library
Like the Doctor, the Master's TARDIS had a well-stocked library. The Master's interests, however, tended toward the evil and arcane. Among the more diabolical works he owned were the Necronomicon, shelved between the Liber Inducens in Evangelium Aeternum and The Black Scrolls of Rassilon. It also included the Book of Vile and its Black Appendix, The Ambuehl Lores and the Insidium of Astrolabus. (PROSE: The Quantum Archangel)
Specific systems
Once, the Master tricked the Doctor into materialising his TARDIS around the Master's, creating a dimensionally recursive loop, (TV: Logopolis) repeating a situation that had previously occurred accidentally. (TV: The Time Monster)
Behind the scenes
The Master's console room and console tended to mirror the Doctor's due to the same set (temporarily repainted) and console being used for filming.
The Melkur was portrayed by Graham Cole.
