As the Doctor's newest companion, Clara Oswald, steps into the TARDIS, take a look back at previous companions that have won over The Doctor's hearts in Doctor Who: The Companions. Along the way, companions past and present talk about how the show has changed their lives, and how they've never quite managed to leave the TARDIS behind.
Virgil Oldman is a world renowned antiques expert and auctioneer. An eccentric genius, he leads a solitary life, going to extreme lengths to keep his distance from the messiness of human relationships.
A DEA agent and an undercover Naval Intelligence officer who have been tasked with investigating one another find they have been set up by the mob -- the very organization the two men believe they have been stealing money from.
Iconoclastic, take-no-prisoners cop John McClane, finds himself for the first time on foreign soil after traveling to Moscow to help his wayward son Jack - unaware that Jack is really a highly-trained CIA operative out to stop a nuclear weapons heist.
Teacher Linda Sinclair (Julianne Moore) balances her staid home life with an incredible passion for her subject, but her routine is forever altered when a former star pupil and his unsupportive father reenter her life.
Ray Breslin is the world's foremost authority on structural security. After analyzing every high security prison and learning a vast array of survival skills so he can design escape-proof prisons, his skills are put to the test.