When Lily and Marshall forget to fix up Ted on a blind date for Valentine’s Day, they use one of Barney’s many discarded girls to see if they may become Ted’s future wife.
Meanwhile, Robin’s obnoxious colleague invites her to a party at his apartment.
President Hassan’s actions become paranoid and Dana’s ex faces capture, while Renee and Jack kick open a hornet’s nest among New York’s Russian underworld.
Patrick Jane and the CBI team investigate when the body of a high-end luxury car sales woman is found in the trunk of a Bentley in the dealership’s showroom.
Claire is upset to find that her friend Valerie is better than her. In the meantime Mitchell helps Gloria with legal issues and Jay had a hard time in the locker room.
When June’s granddaughter suffers renal trauma, Neal stumbles upon a cruel scheme to harvest human organs and brings the case to Peter.
After a violent tremor shakes a Manhattan office building to its core, leaving only one survivor who leads the Fringe Team to believe he is not from this reality. Walter surmises that what shook the building was not geologic, but rather something discovered by him and William Bell many years ago. With another catastrophe imminent, the team races to Jacksonville, the site of Walter and William’s experiments, forcing Olivia to face her mysterious past in an effort to save hundreds of people from certain death.
Jack is set up, Renee makes a sacrifice, and Dana sends her ex into a police warehouse. Meanwhile, an arms trader deals with his sons, and the President buys time.
When a specific group of guests at a wedding in Brookline, MA, suffocate from the inside out, the upsetting and disconcerting crime scene has the Fringe team investigating how the toxin was delivered and targeted. As evidence is taken into the lab, it’s discovered that the wedding ceremony was a testing ground for a weaponized science experiment. Adding to the intense lab investigation, Walter uncovers an alarming formula that reveals a link to a branch on the Bishop family tree. With the escalating threat of more deadly attacks and unexpected familial ties to the case, the Fringe team stops at nothing to prevent further catastrophic events.
Mysteries abound when a family returns from vacation to discover a dead man in their daughter’s bed. Thinking they’re investigating the murder of a squatter, Castle and Beckett soon find themselves unraveling a multi-million dollar heist. Meanwhile, Castle tries to keep Beckett from finding out that they’ve been romantically linked when he’s featured as one of New York’s 10 most eligible bachelors.
H.R.G. enacts his plan to take down the Carnival with the help of Lauren and Suresh. Sylar visits Matt looking to understand his desire to make a human connection, but Matt has a plan of his own. Meanwhile, Peter warns Emma of Samuel’s intentions after his grim vision of the future.