Series finale
Cal takes a wicked pleasure in wiping the arrogant smirk off the face of a computer entrepreneur who Cal believes murdered one of his partners and framed his other partner in order to gain full ownership of a successful social networking site the three created together.
When the Fringe Team visits Massive Dynamic’s assembly of the doomsday device, Walter becomes greatly concerned for Peter’s well-being, so he turns to Nina for added brain power to understand the relationship between Peter and the superweapon. Meanwhile, the discovery of a dead body triggers an intense investigation.
Annie convinces the group to put on a middle school anti-drug production, but finds it continually derailed by Pierce’s efforts to give himself a better role. Meanwhile, Chang attempts to connect with Shirley, while a prank involving Britta’s phone puts Jeff in an awkward situation.
With the mastermind behind Kate’s death uncovered, Peter and Neal explore their pasts to gain answers.
When the detective who investigated Beckett’s mother’s murder is shot before Beckett’s eyes before he can give her new evidence in the case, Beckett’s old wounds are reopened. The investigation of the detective’s death leads the team to an old scheme which may provide the answer to why Beckett’s mother was murdered and who ordered it.
After a baby goes missing, the investigation zigzags all over the place until Cal and his team open a massive can of worms, revealing a family completely crippled by their dysfunction.
An Observer makes contact with the Fringe Team to help rectify a mistake. Meanwhile, Walter befriends Roscoe Joyce, keyboardist for Walter’s favorite 1970s band, “Violet Sedan Chair.” Walter will learn the real reason the band broke up, and realize that the lives of these two men, who have never met before, overlap in strange and unexpected ways.
The team works with a criminal profiler on a double-murder case, and it turns into a contest for Jane, who tries to prove that his way of solving the case is better.
The group members debate whether to add Annie’s crush, who recently enrolled at Greendale, or Senor Chang to the group.
Shirley’s ex-husband comes back into the picture, and she has big news for everyone.
The kids get a surprise of their own when they take breakfast in bed to Phil and Claire on their anniversary. Jay and Gloria’s Vegas vacation plans are ruined by a brutally honest email accidentally sent to Claire,. Mitchell and Cam try to get into a new restaurant owned by a mom at Lily’s preschool.