The gang tries to help Marshall get over Lily. Barney takes him to a strip club, and Ted takes him to a Yankee's game. Marshall finds a credit card trail that leads to Lily's hotel in the city, but the guys try to keep him from going to see her.
Barney teaches Marshall how to pick up women. When things start to go sour for an awkward Marshall, Barney steps in and wins the women over... for himself. Meanwhile, Lily is back from her art experience. While helping her look for a new apartment, Robin gets sick of hearing about Lily's amazing summer in San Francisco.
When Ted's parents come to New York for a visit, their weekend ends up being far from the ordinary when a colossal family secret is unveiled.When Ted, Robin and the gang spend the weekend with his parents, Ted is stunned when a family secret that changes things forever is unveiled at brunch. Meanwhile, Marshall and Lily find it difficult to control themselves when they are forced to spend time together with Ted's parents.
When Barney tries to prove to Ted that his job as an architect is anything but boring by showing him that it is a great way to pick up women, a jealous Robin tracks down her man after hearing of his antics.
After a fight in which Robin insinuates that Ted's job is boring, Barney sets out to convince his buddy otherwise. As the guys test out the pick-up line, "Ted Mosby, Architect" on the ladies, they realize it really works. But when Robin hears that Ted is parading around town picking up girls, she is hot on his heels to discover the truth.
Marshall tries to get used to being single in a world that is very coupled-oriented. Barney intended one-night-stand won't go away. Barney uses Lily to get out of his "horrifying" situation. Lily finds a place to stay.
Barney seduces Marshall's law professor in hopes of getting her to grade more leniently. Lily takes a job at Ted's office, where she promptly steals to teach Ted's boss a lesson.
Marshall goes on his first real date post-breakup with Lily. Not only do Ted and Barney try to warn him that this girl has got the crazy eyes, but Lily decides to do everything she can to find out about this her and break them up. Also, Barney gets a new name.
Marshall and Lily drag the gang to Atlantic City to elope, and their quest to overcome the three-day wait for a marriage license crosses them with some Chinese gamblers, a ship captain, and a sexy novelty shirt.
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.
Barney's brother, James (Wayne Brady), visits and Robin, the only one in the group that has never met him, is suprised. But James has a surprise for Barney that he finds difficult to swallow.
Ted almost ruins Christmas for everyone when, still carrying around anger toward Lily, he calls her a horribly disgusting name. Robin tends to Barney while he has a cold.
Robin wants to tell Ted that she loves him, but she can't tell him. Meanwhile, her sister visits and brings her boyfriend, and Robin doesn't know how to react when her sister says she's ready to lose her virginity.
When Ted is constantly insulted by his former boss, who is now working for him on a project, he is told to fire the man, but he finds that a hard thing to do. Meanwhile, Barney offers Lily a lot of money to paint a nude portrait of him.
When a funeral conflicts with the Super Bowl, the gang vows to avoid hearing the score and watch it together on Monday. This proves difficult, as Marshall is threatened with the score by a boy in Lily's class, while doing the news puts Robin in danger of finding out who won.
Ted can't seem to catch a flight to interview for his dream job and he and Robin contemplate why. The story unfolds backwards as they think about it they remember when Robin and Lily went hunting for a wedding dress and when Barney got stuck on the subway.
Lily gets asked to play in an off-off-off-off-broadway play, and the gang shows up to support her. Ted and Robin get hung up on what each kept from their past relationships. Barney performs his own play to prove a point to Lily.
Marshall is all set to celebrate his beloved Fiero hitting the 200,000 mile mark but it stops. While the gang sits in the mechanic's garage and waits to hear what will happen to the vehicle they think about times gone by that they have spent together in the car. We also get the story of how Ted met Marshall.
Barney takes drastic measures to prevent Ted from moving into Robin's apartment. Meanwhile, Marshall and Lily are discovering the ups and downs of having the apartment to themselves. Barney considers moving in with Marshall and Lily.
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.
Thinking that Bob Barker may be his father, Barney is overjoyed to be a contestant on The Price is Right. Marshall and Lily try sleeping apart prior to the wedding.
Lily and Marshall's wedding day arrives, but nothing goes as they had planned. Surprisingly, Barney steps in to save their once-in-a-lifetime moment.
It's still Marshall and Lily's big wedding day but now we're at the reception. Robin tries to tell a story but keeps getting interrupted. Barney tries his hardest to figure out Ted and Robin's secret.