The Doctor
The Doctor is an alien from the planet Gallifrey who travels in time and space in his time machine - the TARDIS. Its name is an acronym for Time And Relative Dimension In Space. In the movie of 1996 it is said that the mother of the Doctor was a human. The Doctor explores the universe traveling to various places and times and often getting into trouble. His knowledge of science, technology and history helps him escape. He helps those who get into trouble, unless it occurs in a "Fixed-point" of space-time. In episode "War Games" the Doctor says that he stole the TARDIS. Usually one or more of the ordinary people travel with the Doctor. Most of them consciously decided to travel with them, but some of them are random passengers.
The image was coined by the director Dr. Sidney Newman. The first scenario later developed into a series of the Doctor Who script carried the working title of “The Troubleshooters”. In March 1963 the idea was developed by Webber who was invited to help the project. In Webber’s version the protagonist was described as "a mature man of 35-40 years with some eccentricities in behavior." However, Newman created an alternative way of an old man who travels in a stolen time machine, which he called "Doctor Who." So, Doctor Who has existed since May 1963.
Although Time Lords resemble humans, their physiology is different from the human’s in a few key ways. For example, they have two hearts (double the cardiovascular system) and a "respiratory bypass system".
In the sixth season the Second Doctor states that Time Lords can live forever if accidents did not happen. When they happen, they regenerate. In "The Deadly Assassin" the Doctor says that regeneration is possible twelve times. In the introductory part of the film in 1996 the Doctor confirms that the Time Lords have thirteen lives.
The tardis
TARDIS (Time And Relative Dimension In space) is a time machine and spacecraft, product of the technology of the Time Lords which can deliver its passengers to any point in space and time. Doctor's TARDIS is an obsolete type 40 which he "borrowed" leaving his home planet Gallifrey.
The TARDIS is able to transform into something from the outside, but the Doctor’s TARDIS stuck as a police public phone box from 1963.
The exterior part of the police box was unchanged, although over the years small changes have appeared. For example, the sign of a hiding phone on the door has been changed: instead of black letters on a white background there appeared at first white letters on a black background and then white ones on a blue one. Other updates include the constant motion of the words on the panel from "Urgent Calls" to "All Calls". The sign "police box" has not changed after the 18th of the season. In "The Empty Child" it is revealed that the TARDIS despite its appearance as a phone does not work because it is not connected.
The main peculiarity of the TARDIS is that it is bigger inside than outside. The specific capacity of the TARDIS was not concrete, but apart from the living parts it included an art gallery, a bathroom with a swimming pool, a medical department and a storehouse.
The Doctor in "Castrovalva" was able to talk about 25% of the structure of the TARDIS.
Despite the common misconception that the inside of the TARDIS is infinite, it is not. In Full Circle (1980) Romana, the Doctor's companion, argues that the weight of the TARDIS was 5 * 106 kg. Perhaps, he had in mind the weight of its internal situation, as it was shown several times that the TARDIS is so light that it can be easily picked up by few people.
The main feature of control rooms in any of the known configurations is the console that contains tools controlling the functions of the ship. The appearance of the main control room was widely varied, but it always shared a driving part: pedestals, control peripherals, and a moving column in the center, bounces up and down while flying the TARDIS, as a pump. In "Journey's End" the doctor says that the console is designed for six people. This can explain why the Doctor tends to manic running around the console while piloting the TARDIS.
Doctor Who has become such a great part of British popular culture that not only the shape of the phone box has become associated with the TARDIS, but also the word "TARDIS" is used to describe anything that is bigger on the inside than the outside.