Peter Bishop is Back!

They finally brought back Peter Bishop! In the last episode of Fringe, Peter Bishop returned and he explained more of his story and appears to have insight on why no one remembers him. In this time line, the Observer never saved Peter from drowning in the Lake. But for some reason, the Observer has decided not to erase him completely. He was stuck in some parallel dimension or something until he was released by one of Dr. Bishop's failed experiments.

It will be interesting to see how he will get everyone to remember him. I'm sure Walter will find a way at some point  once he gets motivated.