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The secrets of the past are revealed, as Walter attempts to use the cortexiphan children to return the Other Side's Peter to his home dimension. Meanwhile, Young Olivia discovers the trigger for her abilities, and the Other Side's Walter realizes what has happened to his son.
In the 1980s, Elizabeth Bishop his cleaning the family home near Reiden Lake when she discovers that the Other Side’s Peter Bishop, who Walter abducted, has left his room. All he’s left is a note saying, “I’m going home.” Elizabeth runs to the lake just as Peter ties a concrete block to his waist and throws it into the lake. It pulls him down with it, and Elizabeth dives in to rescue him. She manages to pull the rope free and get him to the surface, as Peter screams that she’s not his mother and he wants to go home...Read the full recap
Elizabeth Bishop: He is in such distress. He-he looks at me, and he doesn't trust me. I'm his mother, but no matter what I say, he...
Walter: Elizabeth, Elizabeth, you are not his mother. He's a little boy very much like our son... and we saved his life.
Elizabeth Bishop: No, you...you-you saved his life. I'm just trying to keep him alive.
Elizabeth Bishop: You know, tulips don't usually grow in areas like this.
Young Peter: Well, then what are they doing here?
Elizabeth Bishop: A professor who was working here missed them, so he imagined a tulip that would grow in this climate and he invented them. He used his brain and his imagination to turn the world into what he wanted it to be. How would you change the world if you could, Peter? What would you wish for?
Young Peter: I wouldn't make stupid flowers grow.
Elizabeth Bishop: What would you do?
Young Peter: I'd go home.
Walter: Don't you see what I've done? I crept over in the night, and I stole their child. If we don't return him, they'll figure it out, and they'll come after him, after us. I know because that's what I would do.
Elizabeth Bishop: So you would sacrifice one for the other... this little girl Olivia for Peter?
Walter: No. But for thousands of others, or millions... it would have to be considered.
Elizabeth Bishop: You know what? Maybe it was plastic surgery. Or an alien able to take on any shape he wanted. We've considered all your theories, Walter, and none of them have brought our son back. It happened. It just happened, and it's inexplicable.
Walter: Nothing is inexplicable, Elizabeth. Science seems like magic to primitives. Something happened in this house and we have to go over it, and over it, until we find out what we're missing!
Elizabeth Bishop: Listen to me. Sometimes the world we have is not the world we want. But we have our hearts and our imaginations to make the best of it. I will promise you this. I will be the best mother I possibly can be to you. I'll take care of you, I'll protect you, and I'll never let anyone take you away from me. No one. Not ever.