The first full trailer for Doctor Who's eighth season premiered over the weekend, promising a brand-new, somewhat darker twist on the character. But who is the Doctor anyway? We tried to take a trip back to figure that all out, but our Tardis broke down sometime around the Big Bang. Then there was this whole crack in the fourth dimension... Anyway, here's the best of what we discovered.

Update 4:50PM ET: In an earlier version of the above video, we erroneously attributed some early footage of the new Doctor to the BBC. Also, we erroneously state that the Eighth Doctor, played by Paul McGann, only appears in the 1996 pilot. He also appears in an online-only introduction to last year's 50th anniversary special. We apologize for the errors and have corrected the video.