1. First, let's bear in mind that the two realities we've been watching this season are not the two realities of previous seasons. The two Season 4 realities are realities in which alt-Peter was not successfully rescued by Walter and drowned in Lake Reiden. Our (alt) Peter did indeed come back to our reality, as an adult, in mid-season, but differences between the two realities of Season 4 and earlier seasons can continue, and indeed are ...
Take William Bell, for example. He apparently died in the Season 1-3 two realities. But he need not have died in Season 4's, and indeed he did not. And, he's not only alive, but apparently the evil mastermind behind David Robert Jones. (I never took seriously the report that Leonard Nimoy was never going to play Bell again - an actor can change his mind.) Bell tells Jones that in order for Bell's plan to succeed (presumably, to become creator and master of a new universe), the "bishop" on the chessboard has to be removed (killed).
2. When I first heard that, I just had a feeling that Bell was talking about Jones removing himself, but my wife pointed out that Walter is a Bishop, and she had a point. For that matter, Peter is a Bishop, too, and it looked as if Jones was planning to eliminate Peter - setting a trap for him and Olivia - and indeed comes close to overpowering Peter when Olivia helps Peter dispose of Jones. In his dying breath, Jones realizes that he, Jones, was really the bishop to be eliminated.
3. The way that Olivia helps Peter against Jones was also cool and noteworthy - Cortexiphan has now given Olivia telekinetic powers (moving objects at a distance via sheer mental will and direction), and she directs Peter, on a nearby rooftop, to literally beat Jones. He falls back into an electric grid and is electrocuted.
4. But there's one last stunner. When Bell's bad guys get the drop on Walter and Astrid (whom Walter has a little earlier called "Alex"), she pivots into ass-kicking FBI mode - great to see - knocks down a bunch of villains - and then is apparent shot dead.
I certainly didn't see this coming, and have to hand to Fringe to still surprise and shock, just when you think you have it figured. Looking forward to Part 2 next week.
... Fringe 4.2: Better and Worse Selves ... Fringe 4.3: Sanity and Son ... Fringe 4.4: Peter's Back, Ectoplasm, and McLuhan ... Fringe 4.5: Double Return ... Fringe 4.6: Time Slips ... Fringe 4.7: The Invisible Man ... Fringe 4.8: The Ramifications of Transformed Alternate Realities ... Fringe 4.9: Elizabeth ... Fringe 4.10: Deceit and Future Vision ... Fringe 4.11: Alternate Astrid ... Fringe 4.12: Double Westfield / Single Olivia ... Fringe 4.13: Tea and Telepathy ... Fringe 4.14: Palimpsest ... Fringe 4.15: I Knew It! ... Fringe 4.16: Walter Likes Yiddish ... Fringe 4.17: Second Chances ... Fringe 4.18: Broyled on Both Sides ... Future Fringe 4.19 ... Fringe 4.20: Bridge