Trivia: The glyph code for this episode is REBORN.
Trivia: The Observer can be seen after the break, walking right to left past Walter's lab.
After the body in the morgue explodes, the room is sealed off immediately. When the Fringe team enters the room, they are wearing haz-mat suits with self-contained breathing apparatus. Their helmets are properly sealed at the neck and the gloves aer sealed at the wrists. However, their suits have ordinary open pants legs, rendering the haz-mat suit useless.
Astrid: Walter, Agent Broyles wants to know...
Walter: Yes, yes, I heard. Well, you tell Agent Broyles that as there appears to be no unusual environmental factors to explain the rapid deterioration, that it is absurd for me to make any determination without first examining the remains...
Astrid: Okay, Walter says...
Walter: For all I know, it could be a mutation of some flesh-eating bacteria.
Astrid: He thinks that...
Walter: Some kind of alien parasite. Or... Bigfoot! Bifgoot, that's it! Astrid, perhaps you can look around for massive fecal droppings.
Astrid: He doesn't have any theories, sir.
Walter: (examining a corpse) Remarkably pungent stench.
Astrid: I'm gonna... get some scented candles.
Olivia: So has Walter gotten anywhere yet?
Broyles: Beyond his random theories of vampires and succubi, no.
Aaron: How did your son die?
Walter: Peter was very sick. I tried for a long time to find a cure, but I found it too late and he died. And I discovered an alternate universe where another version of my son was dying from the same malady. So I crossed over to the other side with the intention of bringing him back to cure him. But the frozen lake where I created a portal between universes was unsound. And when we crossed back, the ice broke and Peter... the other version of him drowned. I lost him all over again.
Aaron: And you... don't think you belong in mental institution?
Blair Brown is credited but doesn't appear.
Music: Quinn the Eskimo (Manfred Mann), I Can Help (Billy Swan)
Canada: October 7, 2011 on Citytv
UK: October 12, 2011 on Sky1
Germany: June 25, 2012 on ProSieben
Finland: November 29, 2012 on MTV3