The collaborative wiki-as-fiction site, Secure Contain Protect (previously), held a contest to determine which entry will get the coveted SCP - 2000 spot. The theme? Science Fiction. Read the winning entry here, and the rest of the alien-spaceship-crashing-memetic-virus-watching-living-TV-show-spreading contestants here.
Alex Pappademas and Sean Witzke over at Grantland have a long, detailed, super geeky film-nerd discussion of the Alien franchise. "It's important to note here that this is a nuke-it-from-space kind of conversation in which just about every aspect of the original "Alien Quadrilogy" is spoiled, as are some fairly crucial plot points from Prometheus. The Alien vs. Predator movies are neither spoiled nor discussed, because that would mean acknowledging their existence. Some people will undoubtedly view this as curatorial negligence on our part, but we welcome their scorn. "
Not content with having re-imagined the Justice League, Cartoonist Dresden Codak reboots the X-Men with stranger mutations and more sci-fi backstory.