It started with the top image. An artist called Blue posted a drawing of a Black Widow and Hawkeye cover with the poses swapped. Blue then issued a challenge to other artists: replace the female characters in other comics with Hawkeye. These are just a few examples of what happened next.
It's actually happening. Sure it's happening in a comic book, but the crossover we've always dreamed about will finally be a reality. The Doctor, Amy and Rory will join the crew of the Enterprise-D this May in a comic book published by IDW.
Even if you don't normally read comics, you may want to make an exception for this. What do you think? Can "Doctor Who" and "Star Trek" coexist in the same comic? Or is mixing these two popular series a bad idea?