Original air date: 09/21/2009 Runtime: 21:30 min. When the gang finds out that Barney and Robin are hesitant to define their relationship, Lily forces them to confront their biggest fear...becoming boyfriend/girlfriend. Meanwhile, Ted is anxious about teaching his first lecture at Columbia.
Original air date: 01/11/2010 Runtime: 21:36 min. In the 100th episode, when Barney debates giving up wearing suits in order to land a hot bartender, his conflicted feelings lead to an amazingly awesome musical number. Meanwhile, Ted gets one step closer to meeting the future mother of his kids.
Original air date: 02/08/2010 Runtime: 21:23 min. 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.
Original air date: 05/03/2010 Runtime: 21:36 min. When Ted and Barney jeopardize Robin's new relationship by professing their love for her, Robin realizes that she is finally over them. Meanwhile, after spending a weekend sleeping in twin beds, Marshall and Lily decide to get twin beds at home.
Original air date: 05/17/2010 Runtime: 20:58 min. When Ted takes a date to see a new hit movie, "The Wedding Bride," he is shocked to learn the story is loosely based on his life, and that it was written by Tony, the man Stella left him for at the altar. Judy Greer guest stars as Royce, Ted's date. Jason Lewis, Malin Akerman and Chris Kattan guest star as the movie versions of Tony, Stella and Ted.