The apocalypse broke out years ago but scientists made a pill so zombies could control them selves better and not rot away. if the pill is not taken regularly, the zombie will start to become more pale and have foggy white eyes, and slowly start to act more as a zombie as time goes by. Zombies on the pill are not aggressive at all and can talk, they are basically a normal person besides the fact they are more pale than most and can sometimes go mute for short periods of time.