I believe that zombie creation theories can be sorted into 3 groups, Artificial, Natural, and Religious.


Artificial: This category is pretty self explanatory. it is usually something created by man such as a cure for death (never gonna happen you idiot scientists!), a biological weapon, a way to extend life etc.


Natural: Also, very self explanatory. it could be a way for the ecosystem to fight back against the humans. It could also be a way to stop the human expansion, sort of like a fail-safe defense system for the ecosystem. and many others.


Religious: As self explanatory as the others. Usually it is related to the many theories of Armageddon that seem so popular amongst so many religions. it could be gods punishment for our sins, Ragnarok, Armageddon, etc.




i think the most likely is to be the Artificial and Natural categories. Humans are always messing with things they shouldn't and, the way we're treating earth, its bound to fight back.if any one would like to post theories put your name, the categories, which can be, but are not limited to, the ones above, and the theory.