Dr. Who is the longest running sci-fi TV series of all time. The secret to its longevity is its uncanny ability to recast the lead actor every few years. But who are the people behind "The Doctor?" THE CAST OF DR. 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. As featured on CNN, Time Magazine, People Magazine, LA Times, OK Magazine, and MSNBC! Orbit is a comic book biography series that focuses on the biggest and brightest stars in the world!