Its general concept concerns the story of a relentless zombie apocalypse due to Hranica's strong interest on the subject.

[6] Taking note of the EP's speedier approach, The Devil Wears Prada stated that Zombie has the "fastest music they've ever written" and even admitted that it draws a strong influence from the likes of Slayer and Hatebreed.

Allmusic praised the group's musicianship expressing enjoyment over the array of influenced entwined with the EP's eerie concept.

stated "[The EP] kind of takes me back a good five or six years in the underground metal scene where it was commonplace to use movie sound bites mid-song, albeit this time they use a feigned public service announcement at the start of track three, ‘Outnumbered’.

All lyrics are written by Mike Hranica; all music is composed by The Devil Wears PradaCredits for Zombie EP adapted from Allmusic.