Dedicated to Eric Bauersfeld, who probably deserves better than the same damned joke everyone else is making, but I gots what I gots.
In 2012, IDW published Assimilation2, in which The Doctor, Amy Pond, and Rory Williams teamed up with Jean-Luc Picard and the crew of the USS Enterprise to fight a dangerous inter-dimensional alliance between the Borg and the Cybermen.
In the universe next door, of course, Star Trek The Next Generation died without ever giving us the Borg and Doctor Who had been off the air for several years by 2012, making any such cross-over extremely unlikely.
But then, it’s not like comic books have ever let inherent unlikeliness stand in the way of a crossover.