Doctor Who

Doctor Who is a British science-fiction television  program produced by the BBC  from 1963 to the present day. The program depicts the adventures of the Doctor , a Time Lord —a  space and  time-travelling  humanoid  alien. He explores the universe in his  TARDIS, a  sentient time-travelling space ship. Its exterior appears as a blue British  police box, which was a common sight in Britain in 1963 when the series first aired. Accompanied by  companions, the Doctor combats a variety of  foes, while working to save civilizations and help people in need.

Cast
Legend:
 * * - The main and most prominent character that the actor portrays.
 * S - Abbreviated form of 'Starring'
 * SS - Abbreviated form of 'Special Starring'. Used when a character is only billed in the opening credits for one or two episodes, not an entire series.
 * GS - Abbreviated form of 'Guest Starring'. Used when an actor returns in a small appearance as a non-main character.