What is a zombie, because the futuramaverse does not give a concise idea of what makes a zombie a zombie rather than someone brought back to life.
What I mean is, in Benders Big Score...
Everyone is skeptical when fry seemingly comes back from the dead after bender says he killed him a thousand years ago. Furthermore upon his return bender punches him in the gut to "check" if he is a zombie. Also I guess it is confirmed scruffy is a zombie, (by Hermes maybe, really I can't remember) but nobody seems to care that he would be one.
Also there is one more case of zombie-ism I can't think of. Can someone help a brother out?

An interesting note they don't seem to like brains or drag their knuckles...