User blog comment:ZombiRoll270/John Marston vs Zombies/@comment-184.45.38.184-20131225072645/@comment-5795750-20131225232838

Undead Nightmare is non-canon and the rules of this wiki as well as certain battles here say that battles that didn't happen in canon are allowed - how else do you think we can get away with Marvel vs DC or Robocop vs Terminator?

Also for the record, the zombies in Undead Nightmare are perhaps more akin to L4D's Infected than the zombies we normally associate in cinematic culture i.e. the runners from 28 Days Later or (and I think this is the kind of zombie used in this battle) the slow but very durable walkers shown in the George Romero films and DW's Zombie vs Vampire