Ted's still not ready to date months after his breakup with Robin. But when Robin returns to New York with an exotic new boyfriend, he decides it's time to finally do something adventurous.
Ted has a chance for a threesome with two women, but Barney and Lily try to sabotage it. Meanwhile, Robin's date also goes better than expected, if only she can find a razor.
Robin tries to date a guy with a child, even though she does not like or want children. Meanwhile, Ted finds it impossible to make it with a woman he knows that Barney slept with a year ago.
While everyone meets Ted's crazy new girlfriend, everyone recounts their stories of how they met everyone else--but the stories turn out to have several inconsistencies.
Ted discovers that a porn star is using his name. Marshall is wined and dined by a firm that defends polluters, and Lily's spending habits may force him to take the job.
The guys shatter Ted's impressions of his new girlfriend by telling him she talks too much. Ted responds by turning the tables on his friends, and they react by pointing out Ted's worst flaw.
Marshall warns Barney that the third slap in their "slap bet" will be coming on Thanksgiving night. Meanwhile, Ted and Robin sleep together on the night before Thanksgiving.
On St-Patrick's Day, Ted follows Barney to a bar to party like there's no tomorrow, while Robin discovers something strange about Marshall and Lily's new apartment.
One of Barney's exes is sabotaging his love life, but he doesn't know who. So he makes a NCAA Basketball Tournament-style bracket to figure out which women he wronged the worst.
Marshall cries in front of his boss after he chews him out, and everybody gives Marshall their own unique advice on how to confront his boss about the situation.
Barney is upset because he violated his own "bro code" by sleeping with Robin. How will Ted react when he learns that Barney slept with his ex-girlfriend?
Barney finds a new wingman to replace Ted, but he's painfully shy and awkward around women. Meanwhile Ted discovers that his new girlfriend Stella hasn't had sex in 5 years.
Barney helps Abby get back at Ted by staging a fake proposal, but Abby doesn't realize that it's fake. Lily decides to sell some of her paintings so that she and Marshall can pay for floor repairs at their new place.
Ted breaks up with Stella but immediately wants to take it back after a life-changing experience. However, Stella doesn't realize that he broke up with her. Meanwhile, Barney has a serious accident on his way to see Ted in the hospital.
