The Doctor's TARDIS

The Doctor's TARDIS — also known as the Blue Box, the Ship, the Box, and simple the TARDIS was The Doctor's primary means of transportation across time and space. The Doctor traveled all across the universe in this TARDIS, all the way from the Big Bang to the end of the universe, traveling from the center of the universe to the outermost edges of it. The TARDIS was also capable of traveling between parallel realities, despite the fact that is was not designed for inter-dimensional travel. Like all other TARDIS Models, the Doctor's TARDIS was controlled via a central control console.

The Doctor's TARDIS was a Type 40 Mark III and was often characterized as 'woefully out-of-date'. This was due to the availability of improved models all the way up to the Type 98 TARDIS as well as the discontinuation of the Type 40 TARDIS around The Doctor's 4th Regeneration.

The Doctor's TARDIS was prone to a number of technical faults, ranging from depleted resources, to malfunctioning controls, to a simple inability to arrive at the proper time or location. 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. In the cannon timeline, 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.

At the end of The Equestrian War, The Doctor left behind an animatronic clone to take his place before taking his TARDIS to the edges of the universe where he couldn't be detected, using his time to come up with a plan to retake Equestria. Charles "Mimic" Harrison learned of this shortly after the end of the war but relucted to tell Zealous Tome after failing to locate The Doctor. After formulating a plan, The Doctor traveled into the future to enact his plan. However his plan backfires and ultimetly he's killed by Zealous Tome, bringing The Doctor's era to a close. After The Doctor's death, Charles "Mimic" Harrison obtained The Doctor's Type 40 Mk III TARDIS and hid it away in Ponyville where is would be maintained and cared for until The Doctor's next of kin, Nyx, was able to take possession of the TARDIS.

You can learn more about The Doctor's TARDIS at The Doctor Who Wiki. There you can also learn about the Type 40 and Type 98 TARDISes.