It's the crossover of dreams. If Star Trek is the classic and definitive American Sci-Fi television series, then Doctor Who is that of the United Kingdom. As a fan of both, how could you not want to see the series mashed together?
While the concept might not seem like it makes sense in terms of either of the series' canon, I'm sure that between all the technobabble and wibbly-wobbly-timey-wimey stuff, they have found an acceptable way to bridge the two universes.
In this case, it appears that the Eleventh Doctor (of the current series, played by Matt Smith), will be joining the crew of The Next Generation, along with his faithful companions, Amy Pond and Rory Williams. Why, you ask?
The series, called "Assimilation2," is being run IDW Publishing, and the first issue was released just yesterday, May 30th. It will run eight issues until the end of this year. I suggest you get yourself to your local comic book store ASAP and bag this brilliant crossover and collector's item today.
And now for the depressing news. According to Blastr, prior Doctor Who showrunner Russell T. Davies had once planned an on-screen crossover of the two shows.
But then Enterprise was horrible and got canceled, and it never happened. Alas. Perhaps next year we will finally get our new Star Trek series, and then someone will at some point see fit to give us our live action crossover.
But, in the meantime, we've got this comic book run to keep us happy. Buy it today. Make it so.