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Robin is dating a single dad and ends up forming a close bond with his son. However, when she decides the relationship is too serious, she needs to find a way to end her relationship with both the father and his kid.
Ted bumps into Trudy (the girl he met in The Pineapple Incident). He goes on another date with her and her sorority sister, Rachel, shows up on their date and is very interested in Ted.
After seeing that Robin's new boyfriend, Gael (Enrique Iglesias), attracts girls because he's from Argentina, Barney and Ted decide to pose as out-of-towners and pick up girls in New York.
When Robin shows up with a new boyfriend, Gael (guest star Enrique Iglesias), Ted decides he's ready to move on and hit the town with Barney. While out he meets Amy (guest star Mandy Moore), a tattooed party girl.
When Barney overhears that Ted and Robin have a secret to reveal at the wedding reception, he begins to guess what it might be.
By the time their wedding day arrives, nothing turns out as Lily and Marshall have planned. Barney steps in to help save the day.
Barney is ecstatic about his upcoming appearance on "The Price is Right" because he thinks Bob Barket is his father.
Marshall has his bachelor party, which Barney ruins. Lily has a bridal shower and Robin buys Lily a vibrator as a gift.
When Ted plans to move in with Robin, Barney steals Ted's moving truck to stop him. Marshall and Lily have enjoyed having the apartment to themselves.
While waiting at the mechanic for his Fiero to be fixed, Marshall reminisces about adventures with his old car.