Ted's outlook on his continuing search for love is altered when he rediscovers a shirt that has not seen daylight in years. Meanwhile, Barney amuses himself by coaxing Robin into sacrificing her job by saying completely outlandish things on air live for a cash reward.

Robin accepts Ted's invite to a friend's wedding, but thanks to Ted, the couple may never make it down the aisle.

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.

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.

Robin's musical past emerges again as the group learns of someone named Simon from Robin's past. Barney searches for more Robin Sparkles memorabilia.

Ted and Robin discover that sex with each other solve their fights as roommates, which makes Barney very jealous and angry. Meanwhile, Marshall reveals that he's too embarrassed to use the office bathroom.

Ted goes out on his own as an architect and hires an intern to help get things started, but the intern gets a little too close to others in the gang.

When Robin fears that Barney is cheating on her, she soon discovers that he is spending his evenings with Ted learning everything there is to know on how to date her.

When the gang tries to convince Ted that he is being strung along by Tiffany, they reflect about relationships where each of them has been in the same situation.

Barney's discovery of a Canadian kids show called Space Teens, that Robin appeared on as Robin Sparkles, leads the gang to get her to reach out to her co-star, Jessica Glitter.

After Robin assaults a girl who is out to ruin Barney's relationship, she is forced to begin court-mandated therapy sessions. Meanwhile, Ted gets too involved in Lily's pregnancy.

Ted, Marshall and Barney embark on another "trilogy time", where they get together every three years to watch the "Star Wars" trilogy and envision what their lives will be like in another three years. Meanwhile Barney and Quinn move in together.