Something's niggling me about Fringe. Well, something other than the fact that we've now got to wait until bloody January to find out what the hell Nina's playing at!
Are we to assume, from Peter's comments about wanting to get "home", that the universe we've been watching since the beginnning of S4 is one we haven't yet seen? At the end of S3, Peter was wiped from existence in "our" universe and (I assume) all the others. So have we been watching "our" universe in which Peter died aged 8, or has he reappeared in a different one?
Or does he think that he's not where he should be because he hasn't realised yet what really happened when he stepped into the machine?