Things go crazy when it is realized from Sam Weiss's documents that Olivia has control over the machine. She must shut it down in order for Peter to enter it. That is what the bulk of this episode is about. Peter is unconscious from the beginning and works his way to New York after leaving the hospital. Walter puts things together and realizes that he has to let go of Peter or there is no tomorrow. As things draw to a close, Peter finds himself in a war zone in the alternate universe. Olivia has successfully used her telekinetic powers to manipulate the machines. One episode to go for this season.
Review of The Last Sam Weiss
