TARDIS

A TARDIS is a product of the advanced technology of the Time Lords, an extraterrestrial civilisation to which the programme's central character, the Doctor, belongs. A properly maintained and piloted TARDIS can transport its occupants to any point in time and space. The interior of a TARDIS is much larger than its exterior, which can blend in with its surroundings through the ship's "chameleon circuit". In the series, the Doctor pilots an unreliable, obsolete Type 40 TARDIS, whose chameleon circuit is faulty, leaving it locked in the shape of a 1950s-style London police box after a visit to London in 1963. The Doctor's TARDIS was stolen from the Time Lords' home planet, Gallifrey, where it was old, decommissioned and derelict.