What does 'TARDIS' stand for on Doctor Who? And how come its interior is always changing while its exterior remains the same?

While Doctor Who is the lead of the show, there is usually a trio of people who make up the stars of the series.

Doctor Who‘s TARDIS is a spaceship full of marvels. Not only is it wildly bigger on the inside and basically ... one that grabs your attention. The Eleventh Doctor, Amy, and Rory end up in ...

Watch on DVD or Blu-ray starting March 2nd, 2006 - Buy Inside the Spaceship The Story of the TARDIS DVD ...