I recently watched episode 2x16, "Peter", which sheds some light into the dark Fringe past. We get to see how Peter died, and how Walter managed to open a gate between both universes.One thing I've been thinking about since we get to see Peter's tomb in episode 1x20 is, what happened in the alternate universe after Peter was kidnapped? You know, Walter from this side walks into Walternate's house, and the wife thinks he's her Walter, but... what happened later, when the actual Walternate returns home and his wife thinks he took Peter to the lab, but he didn't? And what happened, or better yet, didn't happen during all those years since Peter disappeared from the other side?
We see that Walter, his wife and their son Peter, all of them exist on both sides; they live in the same house; Walter works in the same lab; both Peters have got the same deadly medical condition; both Walters are trying to find a cure. But... looks like only the Walter Bishop from this side has been involved in the discovery of an alternate universe. If everything else seems to be the same way except for little details, why isn't the "Walternate" also on the same track, being this not a "little detail" but a big one?
Well, we don't see what was he doing beyond trying to find a cure for his son; but as Peter is now an adult and looks like the alternate Walter didn't make any attempts to get his son back, it is safe to assume he has nothing to do with alternate universes. Or it isn't?
Or maybe I am going too fast, and Walternate is the bad guy who's trying to get into this side to make justice on his own hands because our Walter took his son away?