Dr. Bruner: Who are you? And what are they?
Legendre: For you, my friend, they are the angels of death.
Wiry Girl: That's not fair! I had zombies too!
Sitterson: Yes, you had "Zombies", but this is "Zombie Redneck Torture Family". Entirely separate thing. It's like the difference between an elephant and an elephant seal.
"Is there an agreed definition of what is a zombie and how they get that way? Not that I know of. I think zombies are defined by behavior and can be 'explained' by many handy shortcuts: the supernatural, radiation, a virus, space visitors, secret weapons, a Harvard education and so on."
"She's not making sense! If they're moving, they've got brain function! If they've got brain function they're not dead yet!"
— The Last Days on Mars (2013).