We start with Astrid getting a little limelight for once. Hearing a noise, she draws her weapon and gets out of bed. The source of the noise? The radio recovered from the pocket dimension where the miniature baldy was being kept.

Astrid is then startled by Walter, who surprisingly gets her name right and then compliments her hair. She asks him if he fixed the radio, to which he simply repeats her hair is beautiful. He’s a acting a bit weird, even for Walter standards.

Peter, meanwhile, is lying awake. He cannot fall asleep, and has been getting headaches.

He and Olivia are both surprised when Astrid comes in to tell them about the radio. It seems to be repeating some kind of code on a loop. Olivia theorizes it is a message from the elusive Donald. It is revealed that the reason for Walter’s weirdness is that he is under the influence of LSD.

Oh heavens, please don’t let this be another "Brown Betty" episode.

After the theme, we get back to Walter, who is hallucinating his late lab assistant, Carla, and also a little green fairy. On the bright side, Peter seems to be back to himself.

Walter explains that he took a type of acid called "black blotter" to help him remember the plan. He wants to do this quickly so that Nina can remove the pieces of his brain. Ugh… too weird. Peter promises that Walter won’t lose them, but for Walter, this isn’t enough.

Walter is convinced that the “Walter that was” remembers the plan. He is desperate to figure out the plan and get rid of the old Walter forever. He needs a clue.

Once the loony is out of the room, Olivia gets the idea to trace the signal. They decide to enlist Anil for help.

Meanwhile, Walter’s trip continues. He sees Nina trying to stop him from going onto ice, the night she lost her arm. Coming out of it, he realizes that Anil is there, too. Using his tech, they trace the signal.

The source is a forested area, where they find a skeletal hand.

(I want to apologize to everyone for how disjointed this recap is. I’m working with what I’ve got.)

In Willington, Connecticut, the car arrives in the woods from which the signal is coming. We get a heartfelt Peter and Olivia moment, where he apologizes for leaving her again and admits he doesn’t deserve her. I’m distracted, meanwhile, that the huge gash she got on her cheek last week is now a negligible cut. As they lean in to kiss, Olivia spots their target: some kind of RV.

They find the remains of two Observers and a loyalist, killed during a shootout at least ten years ago. Peter next finds Donald’s body in the driver’s seat of the camper. This begs the question: where is the signal coming from?

Peter continues tracing it to a tall tree. Then, he realizes that the tree is not the source of the transmission at all but rather a relay station. He tells this to Olivia, who has the victim’s wallet. (Oh yeah, because she used to be a regular FBI agent. Remember those days?) Apparently, the victim is not Donald but rather our old friend Sam Weiss. NOOOOO!!!!!

Unfortunately, Walter has never heard of Sam Weiss. He is only local to the original timeline. They still don’t know where Donald is.

And Walter is still tripping. He is playing hot and cold with Carla, who believes there is something hidden in the lab. Carla taunts him with his former intellect, and the man he used to be. She tells him to grab his coat and hat to leave the lab again. Walter refuses, much to Astrid’s confusion, and races to his old office. There he finds what he is looking for: a hidden floor cavity that holds the work Carla had been attempting to burn the night she died.

It’s a journal, filled with strange equations and figures. I’m so confused!!

Next, we see Walter in a cab. He commands the cabbie to make change for his $50. Then he finds something strange: the phrase “black umbrella.” It has to do with crossing universes, and his former plan to create his own.

Then, Walter realizes he is in Manhattan, in the Observer precinct. He is appalled that he has broken his promise to Peter. Carla again mocks him, telling him he is still the old Walter. He tries to get out of the car, only to find that he is… with Astrid? At some kind of dock?!

My brain hurts.

They are there to meet Peter and Olivia and rent a boat. They need the boat because they have located the signal’s true origin point: an island in the middle of the lake. Trouble brews ahead, however. A boat full of loyalists has just come to port. The loyalists stop them. After some pleasant chitchat, a firefight begins.

Peter and Olivia provide cover fire while the others hop into the boat. Once the baddies are dead, the team makes a break for it.

When they reach the island, they trace the signal inland. It leads them to a house, and from the house emerges a rifle-wielding bearded man. Olivia asks if he is Donald, and he denies it. He also claims not to recognize Walter. Then, out comes the little bald boy. And next, a woman who calls the man “Richard.” When Olivia explains why they’ve come, the woman, Carolyn, bids her husband to put the gun down.

Apparently, they’ve been expecting someone to come for the boy. But Richard won’t give up until they give the password that was embedded in the signal.  

Words cannot describe what happens next. Following the tradition of the "Lysergic Acid Diethylamide" and "Brown Betty", Walter is suddenly plucked up by a giant hand, turned into Claymation, and flown around with really, really annoying music playing. Holy smokes. What a crock. I will never forgive them.

I can’t even bring myself to write what happens next. Urgh. Okay, he eventually finds a “black umbrella.” That’s all you really need to know. And, apparently, he successfully gives this phrase as the password.

Richard lowers his gun, and Carolyn invites them inside. They learn then that the couple were members of the resistance back in the day. They met Donald eight months after the invasion. He left the boy and left to draw off the enemy. They never saw him again but heard that he had died.

The boy has not aged since he came under their care, and they call him Michael. They’ve been turning on the signal every five days for twenty years.

Commence the touching, no audio for the goodbye scene cop-out that these shows use when the writers don’t know how to capture the mood with dialogue. With Michael in tow, Team F returns to the lab.

Once back, Olivia tries to make little Baldy feel welcome with hot chocolate. She asks him if he remembers her. He nods. Peter is astonished, as they met him in a different timeline. But Olivia reminds him that Observers experience time differently.

Walter, however, is still tripping. He recalls the arguments he had with Carla and his wife years ago. He recalls the fateful night that he tried to cross universes. Golly, I miss the other universe. I wonder how Lincoln is doing…? The last memory to torture Walter is that of the second Peter drowning. (Both Peters died in this timeline, folks. Try to keep up.)

Finally, Walter burns his journal. But Carla tells him that since he has remembered what he is capable of, it is just too late. Figment Nina, however, tries to encourage him. But the last to face him is … the other Walter.