TARDIS is a time traviling device useed to travel to different universes, places, and times. The TARDIS stands for Time and Relative Dimensions In Space. The TARDIS is a police box because The Doctor traveled to the 1950's when the TARDIS could transform into a camoflauged thing from that time, when he traveled to that time, the TARDIS disguised as a police box, malfunctioned and became a police box forever.
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