"Through the Looking Glass and What Walter Found There" is the most surreal "Fringe" episode of Season 5 and one of the most surreal of the whole series. Walter (John Noble) retrieves the next Betamax tape, watches it, then goes off on his own to find the next part of The Plan to save the world from the Observers. That is unlike something Walter would normally do, but nothing in this episode is what it seems, especially after the tape leads Walter to a "pocket universe."
Walter found Cecil
After jumping into the pocket universe to find the next piece of The Plan, Walter finds a man named Cecil (Zak Santiago). Cecil is just a guy who was in the wrong place at the wrong time. He was blown into the pocket universe 20 years before, when the Observers blew the place to smithereens with a light bomb. To him, it has been only five days. All he wants is to get back to a family who is no longer waiting for him.
Walter found himself (on tape)
Peter (Joshua Jackson), Olivia (Anna Torv), and Astrid (Jasika Nicole) follow the tape to the location of the pocket universe, as well, but it stops playing at the point where Walter stepped to the other side on the tape. Astrid guards the opening to the other dimension as Peter and Olivia slip through the dimensional door. They have the Betamax player with them and realize that the video continues when they get to the other side. Once they find Walter and show him the tape, he follows it to the hiding place.
On the tape, Walter was with a mysterious man named Donald, who is never seen. After Captain Windmark (Michael Kopsa) messed with Walter's brain in the Season 5 premiere, his memory is not quite what it once was. Donald was part of The Plan, and Walter can't remember anything having to do with The Plan. He doesn't even know what Donald looks like.
Walter found Observers
The object being hidden was actually a person: the young empath (Rowan Longworth) from the Season 1 episode "Inner Child." The boy may actually have been a young Observer. When Walter sees that the boy is no longer there, he goes a bit crazy. Olivia calms him by noticing an audio recorder that had to have been left by Donald. The recorder doesn't work, so we'll have to wait until next time to find out whether it contains the new location of the boy.
While the team is looking for the young Observer, the evil destroyers-of-the-world Observers show up: Walter had been spotted nearby on a surveillance video. The Observers first knock Astrid to the floor. Then they step through the invisible dimensional door, which is clearly visible to them. The team just barely escapes the pocket universe with their lives, but Cecil is not so lucky.
Peter finds more pockets
In the previous episode, "An Origin Story," Peter implanted Observer tech in his own brain. He is able to save the team from the Observers by using their own tricks against them. He can now see the doorways to other universes and move between them with ease -- the way they can. One of the Observers warns that Peter does not understand what he has done to himself, which is most likely the truth. Let's just hope he can control his new powers without becoming power-hungry. The rest of the team still has no idea what Peter has done to himself.
Walter realized that he's losing himself
Walter realizes that he is becoming more like the man he was when he had barely any regard for other people. After having the missing pieces of his brain replaced, he becomes less of the man Peter helped to create as a loving son. Walter is worried that he will soon lose his newer, nicer self completely.
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