( TV: The Deadly Assassin, The Invasion of Time) ( AUDIO: The Quantum Possibility Engine) Indeed, by at least the time of the Fourth Doctor, if not earlier, the TARDIS model - called a ' Type 40' - had been pulled from general service on Gallifrey, and replaced by more advanced models. The craft was prone to a number of technical faults, ranging from depleted resources ( TV: An Unearthly Child, The Wheel in Space, Vengeance on Varos) to malfunctioning controls ( TV: The Edge of Destruction) to a simple inability to arrive at the proper time or location. ( TV: The Visitation, Attack of the Cybermen, The Eleventh Hour, Victory of the Daleks, The Girl Who Waited and many others) However, because the TARDIS was a living being, these 'faults' may instead have been at least partially attributed to the manifestation of the ship's free will. Indeed, the TARDIS itself once told the Eleventh Doctor that while it may not have always taken him where he wanted to go, it had always taken him to where he needed to go. ( TV: The Doctor's Wife) As the Twelfth Doctor knew her, the TARDIS was always 'looking for trouble' he loved her for it. ( TV: Thin Ice)Īs the centuries passed and all of the Doctor's companions came and went, the Doctor's faithful TARDIS remained their constant companion.

Apart from the TARDIS, the Doctor only had memories. ( AUDIO: Relative Dimensions) They shared an unbreakable bond, and the Doctor came to feel that in the end, it was just the Doctor and their TARDIS, travelling the universe together. ( AUDIO: The Girl Who Never Was, TV: The Doctor's Wife) The Eighth Doctor thought of her as his oldest friend.

( AUDIO: Wild Animals) Such was this bond, that, in an alternate timeline, the TARDIS eventually became the Doctor's final resting place, containing his personal time stream.

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