You, Sam and Dean were taking care of some cases, driving around the country with the Impala. One day they found a strange case, again dead people walking around. "Apparently, there is nothing paranormal about it."Sam says, with a bit of trepidation. "It's something that's happening naturally, a virus." — It's a year since the start of the zombie apocalypse that devastated the earth. There were few survivors. You and the other two obviously, with your skills, survived. You were with Sam, picking up gas from an abandoned gas station to fill up the Impala, so you could go to a better place in search of medicine. As Sam filled the jerry can, you heard a grunt and tried to shoot the zombie that appeared, but you were out of bullets. Then Dean appeared, shooting with a silenced gun. "You two took too long." He says, worried.