Eff you, baseball, for taking away Fringe last week, along with found-in-a-lake-naked Pacey.
So we've got Peter being held at the FBI Building because no one knows him, but he seems to know everyone. And also I guess because he was found in a lake naked. He'll only talk to Walter, and medical tests show that he could indeed be Walter's son. Walter figures it must be a third-universe version of Peter. Peter's just trying to figure out where he belongs and why.
Meanwhile, the transparent Asian shapeshifter is on the hunt for a former Massive Dynamic scientist who worked on cellular replication. And we find out that Olivia and her sister were essentially raised by Nina after their father died.
Peter gets in on the shapeshifter-hunting since he has experience hacking their memory disks. Apparently these new shapeshifters can change their DNA to become totally indistinguishable from the real people - you'd never know they were copies until you saw their memory disks. And Peter was able to track the Asian chick down via her LoJack system. But she eventually gets away. Not entirely sure what the whole main plot of this episode is, but it looks like Olivia has taken an interest in Lincoln, and I fully support that. Also, Olivia had this weird moment at the end where she essentially replayed a moment. An agent handed her a file, she put it down, and then the same agent handed her the same file. Seemed like an odd bend in time that really isn't that odd for this show.
And in the end, we get a reallllly sweet moment between Walter and Peter. Awwwww, my boys are back together... even if it was only for a moment. It ended with Walter saying Peter wasn't his son, that he was there to tempt him.
The Asian shapeshifter tries the serum the scientist made, which I guess stabilizes their appearance. She gets out an even-more-kickass-than-the-old-one Other-Universe Typewriter Communicator, and types in that the serum works. The response? "We're sending the others."
Walter's Food Thing of the Week: He's whipping up custard (Peter's favorite dessert) in the lab.
This Week's Code: STILL.