I wrote a crossover with Left 4 Dead: Writing on the Wall.

If you check out l4d_bigbang you'll find a bunch more SPN crossovers too. :)

The 2010 spn_j2_bigbang had at least one zombie story too, but I cannot for the life of me find it right now. If Delicious hadn't messed up all my accounts it would be a different story... *sigh* (http://ratherastory.livejournal.com/144280.html)

1) Apocalypse Z by baylorsr: Zombies rise with the apocalypse; Dean, Sam and Castiel are trying to get to Bobby's and hunt Lucifer at the same time. This is GEN, but with UST between Dean & Cas. (This is probably the Big Bang story the other poster remembers)
http://baylorsr.livejournal.com/384932.html

2) "On the Road to Siloam" by kroki refur: Thirty-seven days after the apocalypse ends, the majority of the world's population has turned into zombies! Sam and Dean Winchester pull up in Rebecca Warren’s driveway. They ask if they can stay for a while.... GEN
http://kroki-refur.livejournal.com/249551.html


3) Second Verse, Same as the First by oatmeal queen: Dean and Cas are stuck in a day that keeps repeating. Crazy things happen in this endless loop - one of which is a zombie invasion. DESTIEL
http://community.livejournal.com/deancastiel/1002332.html#cutid1

Edited 2011-10-17 06:29 pm (UTC)

http://sncross-bigbang.livejournal.com/39602.html

Title: Walk among the Cobras
Author: spirited_lizard
Artist: caluk
Crossover: Supernatural/The Walking Dead
Disclaimer: Pure-blooded fiction
Type: Gen, R
Word Count: 15,023
Characters/Pairings: Dean, Sam, Daryl Dixon, Merle Dixon
Warnings: Violence, gore, language, character death
Spoilers: Season 1 of The Walking Dead and season 5 of Supernatural
Summary: Atlanta, Georgia. February 2011. It had been several months since the disease spread all over the country. The handful of people who haven’t been infected with the virus, yet, are hiding from the world.
Sam and Dean Winchester investigate the case of what they first think are their ordinary monsters, but what they find, is something else entirely, and will destroy everything they have been working for.