Bolivia and her team call upon their counterparts from This Side for help when a serial killer goes on a bloody rampage. They recruit the killer's This Side counterpart, a professor of forensic psychology, and try to transfer him to the Other Side without his knowledge to put together a profile on his other self. However, things soon go out of control when the professor realizes what's going on.
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Trivia: The Observer can be seen in the hospital behind Broyles and Olivia as they discuss how John has lost his memories of Margery.
Trivia: The glyph code for this episode is LIMBUS.
In the scene directly after Lincoln tells his team to recover Noreen without harming her, John talks to his counterpart. The killer has an earpiece in his left ear in the first shot but it disappears for the rest of the episode.
Walter: Immoral, evil...
Astrid: Walter, we have been over this. What is in the past in in the past. We have agreed to move forward.
Walter: Even I don't have drugs strong enough to forget they kidnapped Olivia to the Other Side.
Lincoln: They did?
Walter: Two weeks that awful woman pranced around my lab.
Lincoln: Awful woman?
Astrid: Uh, the other Olivia, the one from Over There.
Walter: She bought my ignorance with baked goods while she carried out her plan to steal a piece of the Machine with that damned Portuguese sweetbread.
Olivia: What's with the redecoration?
Astrid: Walter. Hey, don't look at me like I have some reasonable explanation. It's Walter.
Astrid: Well, (Lincoln) just lost his partner. Plus he is new in town. He doesn't know anybody. He's probably a little lonely. Olivia: No. Not going to happen. Astrid: Why not? He's cute. Olivia: Because if I went out with him, then I would start having second thoughts, like I always do, and then he would get hurt, and then my workplace would become awkward. And you know what? He's not even my type. Astrid: Do you ever think that maybe your type just doesn't exist?
Olivia: He knows what she taught him, but he can't remember who she is. How is that possible? Broyles: At the risk of sounding sentimental... I've always thought there were people who leave an indelible mark on your soul. An imprint that can never be erased.
Blair Brown is credited but doesn't appear.
International Airdates: Canada: September 30, 2011 on Citytv UK: October 5, 2011 on Sky1/Sky1 HD
S 4 : Ep 22
Aired 5/11/12
S 4 : Ep 21
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S 4 : Ep 20
Aired 4/27/12
S 4 : Ep 19
Aired 4/20/12
User Score: 3056
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