The rest of the gang uncovers Barney and Robin's clandestine romance. Ted fights his nerves over his impending teaching debut at Columbia.

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Stella has to give Ted an answer. Barney wants to say something to Robin.

A "burger-mad" Marshall is on a quest to find the place where he ate the first hamburger he ever had in New York.

When Stella's babysitter cancels, a night out turns into the gang hanging out at her place, and Ted talks up New Jersey—until he learns Stella wants him to move there after marriage.

When Ted is packing his stuff for his move to New Jersey, he discovers that the gang was going to hold an intervention for his engagement to Stella and demands they hold it anyway.

Deciding to wed in three days, Ted and Stella suddenly see their plans shattered by exes.

A chance sighting of Stella leads to the gang contemplating ways in which they'd handle an unwanted encounter with a person from their past.

Barney creates a holiday to celebrate not being a father. Meanwhile, Lily and Marshall are considering having a baby, but Lily first wants advice from Ted and Robin.

A birthday party for one of Lily's co-workers leads to Robin connecting with a group of single partiers known as the "Woo Girls". Ted presents a plan for Goliath National Bank's new HQ.

The gang learns a new way to get their dates to sleep with them after Ted walks in on Robin's date sitting naked on the couch.

Ted—to prove he's not a milquetoast—and Barney—to impress Robin—pick a fight with a group of guys sitting in the gang's favorite booth at MacLaren's.

Marshall takes Robin to a bar with a Minnesota theme. Ted attempts to keep his visiting sister away from Barney.