Almost 50 years since it was first broadcast on British television, Doctor Who is the longest running science-fiction television series of all time - and one of the most beloved. The secret to its longevity is its unique ability to recast the lead actor every few years. But who are the people behind 'The Doctor?' The Cast of Doctor Who takes you back in time to learn about the personal histories of William Hartnell, Tom Baker, Paul McGann, and the newest incarnation of The Doctor: Matt Smith. Plus, the Book Market edition features a bonus biography of Peter Cushing, the legendary actor who portrayed the Doctor in two theatrical films made in the 1960s!