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When Robin arrives home with a hunky Argentinean boyfriend, Ted decides to go out with Barney for a "legen...wait for it...dary!" night to forget about Robin moving on. Guest starring Enrique Iglesias as "Gael" and Mandy Moore as "Amy".

After seeing girls swoon for Robin’s boyfriend, Gael, because of his foreign charm, Barney and Ted try to pull themselves off as out-of-towners in order to meet girls. Marshall and Lily write letters which are to be read after their death, while Robin begins to lose her relaxed self she had when she vacationed in Argentina.

Two women become very interested in Ted and end up taking the party to his place. The gang must show Ted that bad luck doesn’t come in threes.

Robin dates a single dad, and to her surprise, bonds with the man’s son, which causes her to worry that the relationship is too serious. Meanwhile Ted and Barney compete to see who has more ’game’.

Ted’s new girlfriend becomes jealous that the story about how Ted and his friends met is better than how she met him, resulting in her ranking on Barney’s "crazy scale" to go through the roof.

When a law firm tries to recruit Marshall, executive Jefferson Coatsworth (John Cho) is able to win him over, forcing Marshall to stray from his dream to save the Earth. Meanwhile, the gang finds out that a porn star is named after one of them.

Lily and Marshall make a rash of irresponsible decisions when buying an apartment in the "Dowisetrepla" neighbourhood, while Barney uses this opportunity to hook up with women without giving away his address. Marshall learns about Lily’s secret.

An annoying habit in Ted’s new girlfriend causes the gang to point out their own bad habits which are unnoticed by the group. Marshall turns to Barney for help after forgetting his password to check his bar exam results.

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.

After everyone joins a gym, Barney sees Rhonda (the woman who took his virginity) there. After learning that his performance with her was poor, he loses his ability to approach women. Barney loses his ’mojo’ and heads to the Victoria’s Secret Fall Fashion Show party to try to get it back, but he’s put to the test when he meets Heidi Klum.

Ted’s friends try to discourage him from going on a date with his doctor, a person he sees regularly, by telling their own bad experiences.

Ted decides to take on Barney’s lifestyle for St. Patrick’s Day, which would likely include activities which are very un-saintly. Robin and Marshall don’t know how to tell Lily that something is wrong with their new apartment.

While Ted is repeatedly rejected for a date by his dermatologist, Stella (Sarah Chalke), her receptionist, Abby (Britney Spears), becomes interested in him.

A mysterious woman is sabotaging Barney’s attempts to hook up with other women, forcing him to use a tournament bracket to narrow down a group of 64 women who have a reason to hate him.

Marshall cries in front of his boss after he screams at him, and everybody gives Marshall their own unique advice on how to confront his boss about the situation.

Robin rekindles a spark with Simon, an old flame (James Van Der Beek), but he ends up breaking her heart again. Barney and his own inimitable style helps make her feel better. Guests appearances Tiffany and Alan Thicke.

After sleeping with Robin, Barney feels guilty and hires Marshall to search for a loophole in the Bro Code in order to maintain his friendship with Ted. Meanwhile, Lily decides to rescue a goat while the gang plans Ted’s surprise party.

Stella is finally ready to get intimate with Ted. Meanwhile, since his split with Ted, Barney searches for a replacement Bro, finally settling reluctantly on his hapless co-worker Randy (Will Forte).

Lily is forced to sell her paintings in order to fix the slanted floor in her apartment. Barney finally confronts his mysterious saboteur and uses this opportunity to strike a blow to Ted.

Ted re-evaluates his life and his relationship with Stella after a close call with death from an accident. Marshall and Robin debate about the existence of miracles.