Walternate turns on the doomsday machine with the help of half of Peter's DNA, siphoned from Fauxlivia's baby's blood. Immediately, our world feels the effects; plagues of locusts, loss of livestock.
Both Fringe Divisions are against Walternate using the machine.
As Olivia searches for Sam Weiss for answers, Fauxlivia attempts to travel between universes in an attempt to take Peter back to stop Walternate, believing he is the only hope. Her plan fails.
Walter realizes he has to let go of Peter and allow him to try to save the world, even if it means losing his son.
Peter attempts to make contact with the machine and it rejects his touch, sending him spiraling to the ground with a great jolt of electricity.
Sam Weiss finally shows up and asks Olivia to take him to the machine. He seems to be the only man alive who has a clue to what to next.