Well in the last scene it appears that he is a shapeshifter, thus the real Broyles is worm food 
I admit I have forgotten a lot of details. My brain is awash with the fantastical rules from so many different TV shows, I can’t keep them straight.
I wonder if that’s the real Nina or a shapeshifter?
Excellent question. Nina is so shady I wouldn’t doubt if it’s the real her, but it very well could be a shape shifter.
Walter crosses over to give Peter the serum to save his life. The vial containing the serum gets shattered so Walter brings Peter back to our universe. After saving him he and his wife decide to keep him.
Meanwhile, that one trip started cracks in the fabric of reality and their side was effected much worse than ours.
Oh, and sorry for a three-fer, but I just wanted to add that I’d like to see Thomas Jerome Newton (Sebastian Roché) make a return. And now that Prime Suspect has been canceled it would be nice to see Charlie return.
IMO, Peter has always been a completely selfish prick–I utterly loathe the character. (Not the actor). The character is a smug, self-satisfied, self-indulgent, smug prick. From his treatment of Walter in the first episodes onward.
I like the fact that the writers seem to be acknowledging that. I don’t want Peter out of the show–he’s a great catalyst…I just want them to deal with the fact that Peter’s far more of a sociopath that Walter.
That aside, I thought this was a freakin’ great episode.
(Also, I don’t buy Peter’s hypothesis that these are two new Earths and his still exist. He changed time–these are the same two universes as before, just minus Peter)
Fully agree on Charlie. I miss that gravel-voiced little spud. The show really lost something when he left.
Yeah, but as time went on Peter seemed to be softening. But this, yeah yeah, your worlds are in danger, whatever, just get me home, type attitude shows he hasn’t changed much at all. Or he’s reverted back.
Agreed.
I’m beginning to wonder if maybe this isn’t some sort of parallel timeline. It could explain how Peter still exits. He jumped from one timeline to the other.
Maybe it’s like the Back to the Future timeline theory, where when a change is made another timeline branches off from there.
Yeah, and although dead in the main universe he’s still alive in the alternate one. So here’s hoping the writers bring him back.
Well then, it does appear I have indeed missed a scene, because I don’t recall that at all. Guess I’ll be checking out the ep on On Demand. 
Thought it was more like “Walter brings Peter back to our universe, but the device for crossing over is destroyed in the process, and Walter doesn’t try too hard to recreate it”. That being said, I don’t think Walternate ever realized that Walter’s original plan (to visit the alternate universe and give Peter the cure, that he knew that Walternate would not find) was altruistic - from Walternate’s POV, Walternate was working on a cure, and had every hope to come up with one, when Walter kidnapped Peter - and wrecked the alternate universe to do it. Walternate’s not the type to believe Walter, even if Walter choose to tell his story, and Walter feels too guilty to tell it, anyway.
They don’t show Broyles getting killed. At the end of the ep when Olivia and Lincoln ask Broyles for some leniency pursuing the phone call trace, after they leave Broyles calls David Robert Jones to warn him. And Jones is behind the new shape shifters.
In the original time-line, with his shape-shifter spies and whatnot Walternate seemed to know an awful lot about what was going on in our universe.
I think he figured things out, but was still pissed. It wasn’t that bringing Peter here was so bad, but he never brought him back. And maybe it was an accident that Walter caused vortexes to open, but it doesn’t change the fact that millions died because of him.
Regardless of intent, Walter screwed over Walternate and his universe.
You could be right about what Walternate knows; you’re certainly right that Walter is responsible for the deaths of millions - part of the arc of the series was the growing realization that the actions that the other universe is taking against ours have a very understandable justification.
Yeah, rewatched the scene in question, just shows that Broyles is in league with the shapeshifters, not necessarily that he is one (though certainly he could be).
I could be wrong, but I’m positive that he’s been replaced.