At the end of Fringe's third season, there was a significant change. Simple question with a not-so-simple answer (spoiler):
If Peter died as a child, who used the Wave Sink device and joined the two universes together? And when?
At the end of Fringe's third season, there was a significant change. Simple question with a not-so-simple answer (spoiler):
If Peter died as a child, who used the Wave Sink device and joined the two universes together? And when?
Hm, I'd forgotten about this question. It's been a while, but somewhere mid-season, Walter explicitly states that:
The machine did it on its own once they put the pieces together. No one made it connect the universes.
We can guess that the machine has some sort of link between the original timeline and the new timeline - one of the reasons Peter thought he could use it to get home - but it has not been definitively proven.
Also:
I believe it was stated in one of the episodes where Walter and Peter were building an interface to the machine. This would imply that the version of the machine in this timeline doesn't have the Peter-only interface the original timeline did, and may be a hint towards a stable time loop: The machine only responded to Peter in the original timeline because he built it that way in this timeline.
I think it was Peter. The thing is that that exact event (him activating the machine) was what changed the timeline. But that doesn't change who did activate it.
The main issue regarding this matter, is the fact that we are stuck in a paradox. Much like the creation of the machine itself: it is not certain who created it, but it was sent to the past by Walter, through the wormhole in Central Park Over There (in this transcript of the last episode of season 3, look for "Peter's Residence - Time Paradox"). This means that this loop would repeat itself, thus, the machine would not actually have been created. It was just there. At least I think this makes sense... but do correct me if I'm wrong!