TARDIS (Dr. Who and the Daleks)

TARDIS was a space-time vessel invented by the Human scientist Dr. Who. It was larger inside than without and filled with electronics and masses of wiring. Its exterior resembled a police box. (Dr. Who and the Daleks, Daleks - Invasion Earth 2150 AD) Considered a matter transmitter, TARDIS is described by Dr Who as it simply breaks itself and everything inside it into constituent electrical charges and sent to the destination. Travel is instantaneous - it took only a second for TARDIS to travel from Earth to Skaro. This changed as later in the next film, the travel function appears to have altered, the journey becomes gradual. TARDIS appears to travel in some kind of vortex - probably a wormhole, which acts as a spatial drive with a temporal displacement field for time travelling.

Behind the Scenes
The interior of TARDIS (not called "the TARDIS" in the films) did not use the familiar television set-up of a central console with walls on each side, but more a random assortment of technological apparatus. The dialogue did not indicate that Dr. Who's TARDIS could change shape, thus making it a mystery why it resembled a police box on the outside (though it's likely Dr. Who simply used an old police box as the shell for TARDIS). Later on in the sequel movie, TARDIS underwent a change to the interior and was no longer a random assortment of wires and electronic circuits but with control consoles in silver casings. There is also a bench with lab equipment; test tubes, bunsen burners etc. When Tom Campbell stumbled into the machine from the recent robbery, Susan was seen next to a gauge on some sort of generator and she was recording the reading on a clipboard. Whether this is TARDIS' primary power source is unknown.