This variant was given to the participants, "zombies" and "survivors" alike, of the Petco Park Walking Dead Escape challenge, which was a cross-promotional event to the 2012 San Diego Comic Con.
This page contains the indicia and credits for this issue with a recap of the story so far.
Letters from David Fiorito, Jack Russell, Matt Ferguson, Vernon Smith, Kenneth Taber, Will Tucker, Andrew Barr and Dave Sunhammer.