In a flashback episode, the gang ponders the future of the Ted, Robin and Barney love triangle. Meanwhile, Barney accepts a series of challenges from Lily and Robin.
Westport is known for its Halloween tradition of leaving an anonymous note and goodies on a neighbors' doorstep - called a "Boo". Katie is absolutely giddy when the Ottos receive their first "Boo," only to find out it was put there by accident.
[Season Finale] In the series finale episode, Lisbon accepts Jane's surprise marriage proposal, but a killer's quest for revenge may cost them the happy ending they've worked so hard to achieve.
Will and Stevie get stuck in the middle of a marital face-off. Dr. Blake's entire surgical team mysteriously collapses during a liver transplant. Charles encourages Ethan to reconcile with his father.
Mrs. Adler has had it with everyone having an opinion about her pregnancy. Ms. Watson joins a makeup pyramid scheme, and Ms. Bennigan gets caught in the middle of disputing custody parents.
