According to Lawler, a rough version of the song was initially titled "In Your Head", which was included in the band's live set; it was then later revised to "Zombie".

First off, in the old movies, the word Zombie was snicker inducing. If you're trying to be serious, and someone on screen says Zombie, all pretense of seriousness is gone. Then and now, 'Zombi' is a funny sounding word to English speakers.

After killing the vetalas, Krissy tells Dean that she and her father will give up hunting. Krissy and her father lived a normal life, until Lee was killed by a vampire. Victor Rogers brought her to join a group of young hunters trained by to get revenge while living a normal life at the same time.

Krissy Chambers is the daughter of Lee Chambers. Her father disappeared, and since then she has been affiliated with the Winchester Family.