The Valentine's Collection

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.

Barney declares February 13th "Desperation Day," a holiday for desperate women. Meanwhile, Lily surprises Marshall for Valentine's Day, Ted and Zoey continue to figure out their relationship and Robin bonds with her single girlfriends.

For Valentine's Day, Lily and Marshall invite Robin and Kevin on a weekend getaway to Vermont, where Kevin and Robin discussing taking their relationship to the next level. Meanwhile, Barney realizes he has finally met his match.

Continuing his passionate quest to find the woman who will one day be his wife, Ted pursues his beautiful dermatologist, Stella. While Stella turns down his repeated efforts for a date, her office receptionist, Abby, becomes smitten with Ted.

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.

When Ted goes on a date without researching the girl on the Internet, the gang interferes, showing Kevin that they are too into each other's business. Meanwhile, Lily and Marshall come to terms with finding out the sex of their baby.