Doctor Who dates back all the way to 1963 and is still running to this day, making it the longest-running science fiction show in the world. It stars the titular Doctor Who, a genius alien “Time Lord” who commands the time machine TARDIS, which takes the iconic form of a 1950s London police box. TARDIS randomly deposits the good doctor in different locations in time and space, wherever there is a problem only he can solve. With over 700 episodes and counting, the Doctor has been challenged by every situation you can think of, from bizarre aliens to rival Time Lords, and has even come back from the dead ten times!

That’s right, the Doctor can regenerate upon death, coming back with a new body and personality. Dr. Who is the time travel enthusiast’s answer to the James Bond series, with eleven actors each putting their own unique spin on the character. Fans will argue until the end of the series (or the end of time, whichever comes first) on which Doctor’s adventures were the best.

Tom Baker, the Fourth Doctor, continues to be the most iconic; he had the longest run on the tv series and his episodes were the ones most frequently broadcast overseas. His neurotic streak, including an excessively big scarf and a coat packed with jelly beans, remains the definitive version of the Doc to many old school fans. Still, many argue that 2005′s debut of David Tennant, the Tenth Doctor, was the start of the series’ best episodes, perfectly mixing modern CGI and editing with the classical intelligence of the old series. And of course, everyone else has their own favorites. If you’re a fan, who’s your favorite Doctor?

Even if you’re new to the series and Matt Smith’s Eleventh Doctor is the only one you know, we still have plenty of ways to show the love. Even if you can’t pick a favorite Doc, we have great Doctor Who t shirts featuring all the great recurring symbols of the series. The Doctor may change, but the TARDIS is recognizable the world over. And who can forget those lovable exterminators of all life in the universe, the Daleks? Their robot suit is an essential cultural icon, with a 2008 survey revealing that 9/10 British children can identify a Dalek. With a cool Dr. Who Dalek T Shirt, you can prove that you can too!