Walter tries to help by traveling to the alternate universe when a Fringe event threatens both worlds.
The event is a plane crash over there, with victims over here.
Alt-Lincoln's funeral is held.
Fauxliivia and Lincoln work with Walter on the other side.
Jones and Alt-Broyles are working together, but not willingly.
Walter apologizes to Alt-Broyles for the damage he's caused to their universe.
Jones asks Alt-Broyles to affix a device to the machine.
Alt-Nina confirmed to Fauxlivia that Alt-Broyles was the mole.
Alt-Broyles turns himself in and is given a cell across from Alt-Nina.
Walter determines Jones wants to collapse both universes.