Valentine’s Day unexpectedly finds Frankie and Mike home alone and ready for a romantic evening while Brick is away at his first sleepover, Sue goes to her first boy-girl party, and Axl has a big date night planned with some friends. But Cupid’s arrow doesn’t exactly hit the target, and the best laid plans soon begin to unravel.
Alicia defends a man accused of killing his child’s babysitter. Peter’s appeal seems to be going well. Alicia prepares for the idea of him returning to her life.
A beloved former major league baseball player is found dead after a goodwill trip to Cuba. The investigation, which includes running into Joe Torre, leads the detectives into New York’s Cuban community to solve the murder. Meanwhile, Alexis’ genealogy project forces Castle to consider the identity of his unknown father.
Everyone bands together to try to stop Samuel from taking the lives of thousands. Peter joins forces with his most unexpected ally to save Emma. Meanwhile, H.R.G.’s life hangs in the balance as he and Claire find themselves trapped underground with oxygen quickly running out. Elsewhere, Hiro starts to come to grips with the decisions he has made and is called into action to help stop a disaster.
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.