Robin shows up with an Argentinean lover, causing Ted to go out for a night on the town with Barney where he hooks up with a tattooed party girl.
On seeing the girls reaction to Robin's new man from Argentina, Gael, Barney and Ted decide to pose as out-of-towners, in order to meet women. Meanwhile, Marshall and Lily prepare "death" folders for each other.
Two beautiful women show that they are both very attracted to Ted and take the party to his place. Here the gang helps Ted realize that bad luck doesn't always come in threes.
When "kid unfriendly" Robin surprisingly forms a bond with the young son of the guy she is dating, she decides it is too serious and must figure out a way to let the little guy down.
When Ted's new girl becomes jealous that the story of how he and his pals met is better than the story of how she and Ted met, her ranking on Barney's "crazy scale" skyrockets.
When a corporate law firm courts Marshall, lawyer Jeff Coatsworth wins him over, forcing him to let go of his dream of saving the earth in favor of the almighty dollar.
When Lily and Marshall decide to buy an apartment, not only do they make every mistake in the book, but Marshall also discovers Lily's dirty little financial secret when they apply for a loan.
When Ted thinks he has met a wonderful girl, the gang can't help but point out a deal-breaking flaw, that eventually leads to a heated exchange of barbs among the group.
As Lily and Marshall host their first Thanksgiving as a married couple, Barney is tortured by the tick-tock of the slap bet countdown clock and the uncertainty of the exact moment Marshall's slap is going to be delivered. Meanwhile, Ted and Robin try to deal with the way their relationship has changed since they broke up.
The gang joins a gym. Meanwhile, Barney encounters his first sexual partner, Rhonda, and she tells him that his brother asked her to sleep with Barney. So Barney, Marshall and Ted head to the Victoria's Secret Fall Fashion Show after-party to prove that he's still got it, but his skills are put to the test when he meets supermodel Heidi Klum.
When the gang finds out that Ted is taking his doctor on a date, they try to convince him, through examples of their own toxic experiences, why it's never a good idea to get into a relationship with someone you see on a regular basis.
When Ted takes a page from Barney's book and lives like there's no tomorrow, he gets a post St. Patty's Day reality check from Marshall.
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.
A mystery woman sabotages Barney's love life, and to try to figure out who she is, Barney creates his own set of tournament brackets to decide which of 64 women has the most cause to hate him.
Marshall questions his decision to take a job in a corporate law firm after his boss emasculates him verbally.
When Robin rekindles things with an old flame from her pop star days, he crushes her again, but Barney, in his own inimitable style, helps her realize that she is awesome and ends up sleeping with her.
In sleeping with Robin, Barney has broken the most important code in his life the "Bro Code." Barney eventually tells Ted, but doesn't no what to do when Ted tells him he doesn't think they should be friends anymore.
When Ted tells the gang Stella's intimate secret, he must face the consequences of breaking her trust.
When Barney and Abby (Britney Spears) realize they share a hatred of Ted, they go to a bar together to rub their relationship in Ted's face.