They appeared in this one because they appeared in all the others. Like I said, this is the fourth movie in a series.Originally Posted by lordblazer
As for why they appeared in Night of the Living Dead - well, they never explain it but it isn't really important anyway. The most they ever do in any of them is speculate that maybe it's divine retribution.
Well, one minor correction, in the original NotLD, they suggest that perhaps it is due to cosmic radiation, but they never confirm it, and never explore it. Everybody's too busy trying to stay alive to be overly concerned about what's causing it. And even though they suggest it, the fact that it is never mentioned again, particularly in Day of the Dead which focused on a bunch of scientists trying to figure out what was causing it, basically means that - well, I bet Romero hasn't even decided what caused it.