A father tells his children, through a series of flashbacks, the journey that he and his four best friends undertook, which would lead him to meet their mother.
Christmas approaches and Ted wrestles with whether to tell Robin about Barney's intentions involving Patrice, while Marshall and Lily get an early Yule gift, a night away from Marvin, but a case of separation anxiety strikes and threatens to ruin the evening.
Barney gets emotional when he opens up to Honey about his life. Ted admits to having feelings for Zoey to the group.
On the 200th episode, The Mother recounts how she met Ted and what she’s been up to for the past eight years.
The gang works together to plan a legendary bachelor party for Barney.
After his relationship with Robin ends, Barney dusts off his "playbook" to help him back into the dating scene
As the gang prepares to go to Robin and Barney’s wedding, Ted invites Lily to see the house he's finally finished fixing up. Meanwhile, Robin and Barney’s night of relaxation is ruined by an obnoxious couple, and Marshall takes the baby on a last-minute trip to Minnesota to see his family.
Robin takes steps to have Patrice fired from WWN, while Marshall puts a jinx on Barney. Later, Ted invites his architecture professor to the dedication of the GNB building, and Marshall and Lily bump into an oddball acquaintance from college.
Ted is conflicted when Victoria approaches him on her wedding day and asks him to elope. Meanwhile, Barney and Quinn are arrested by airport security while on the way to Hawaii when Barney refuses to open a box they are traveling with.
The gang learns a new way to get their dates to sleep with them after Ted walks in on Robin's date sitting naked on the couch.
Robin and Barney bond when they intervene in Ted's relationship, and Marshall and Lily watch a ticking clock as he fears that he soon will be the victim of food poisoning.
The gang encounters a guy at the wedding who intentionally stirs up trouble among them, and Marshall finally arrives at the Farhampton Inn.
Ted tries to keep Robin from going on a camping trip so that she can spend time with him. Barney enlists the help of an old flame to perform a rain dance. At the same time Marshall finds out about Lily's interview for the fellowship in San Francisco.
Lily and Marshall have their first Thanksgiving as a married couple; Barney is tortured by the slap bet countdown clock, worrying about when the slap will be dished out.
A mysterious tape arrives for Barney from one of his numerous ex-girlfriends, and the entire gang watches it. But, in order for them all to find out how she broke Barney's heart and made him into a suit-wearing bachelor, everyone must share their most embarrassing moment.
With only a half-hour to go, both Barney and Robin have panic attacks about their upcoming nuptials. Meanwhile, Marshall and Lily rewrite their old wedding vows.
When Lily goes into labor, Ted and Robin distract her by telling her stories while Marshall hurries back from Atlantic City.
Robin is nominated to receive an award for a news report and everyone needs a date to take to the show. Barney introduces Ted to Mary as a date that Ted can take to the show. Originally Ted is opposed to the idea of just trying to save face in front of Robin but when she shows up with a date he changes his mind. Robin asks Mary lots of questions, and Ted begins to really like Mary, despite her occupation.
Ted and Barney discusses their viewpoints on knowing things about women. Barney thinks that the more you know the more likely you are to find a deal breaker. Ted wants to know the deal breakers right away, as Robin refuses to go to the mall to cover her secret.
When Ted leaves the bar early to prepare a Thanksgiving feast for his friends, the gang winds up partying all night with The Blitz, an old friend from college who has bad luck. As a result Ted is forced to spend Thanksgiving with Zoey.
Barney continues his pursuit of Quinn. Ted has to deal with Robin's old room, while Robin gets a taste of suburban life from Marshall and Lily.
While the gang reminisces about Hurricane Irene, Barney tries to cut a deal with Marshall and Lily to get out of wearing the Ducky Tie.
Ted finds a new woman at the wedding. They want to remember the evening so they don't exchange last names or numbers; but Ted takes a big fall when he tries to find out her name.
When Barney starts to have real feelings for Nora, he worries that something is wrong with his heart. Meanwhile, Robin starts dating a guy who acts a lot like a dog.
Barney is shooting to have the rehearsal dinner at a laser-tag venue, while Lily is upset when Ted fails to live up to a promise.
Robin attends Lily's bridal shower and finds the gift that she brought is out of place. Barney hires a stripper for Marshall's bachelor party.
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