User blog comment:Damac1214/Vonderhaar tweets interesting tweet about the possible future of Zombies/@comment-174.225.136.253-20130531203323/@comment-4921618-20130602024200

Only logical explanation I see is them making it to Area 51, and getting a teleporter to the moon, and the moon has a teleporter bringing them to Mars, which has a US Base there set up sometime in the era.