Ted and Stella get engaged, but Ted soon learns that he doesn't know anything about her. Meanwhile, Barney confesses to Lily that he's in love with Robin
Marshall claims that he had the best hamburger in the world during his first week in New York City, but he forgot where the burger joint is located. The gang then hits the streets of Manhattan to help him find it.
Ted does not want to move in with Stella because he hates New Jersey. Robin prematurely quits her TV job because she incorrectly thinks that she already has a new job.
Ted, Robin, Marshall, and Lily all begin getting cold feet because of their imminent life changes, and Barney tries to prove that he can pick up a woman while posing as an 80-year-old man.
Ted and Stella move up their wedding date, but the wedding may not go off as planned after Ted breaks the "No Exes Rule" and invites Robin to come in from Japan for the wedding.
Lily is disappointed to discover that Robin is secretly a "Woooo! Girl," and Barney secretly sabotages Ted's chance to get the contract to design a new bank skyscraper.
Ted tries to keep his irresponsible sister from hooking up with Barney during her trip to New York, and Robin starts hanging out with Marshall at a bar for Minnesotans, not telling them that she's really Canadian.
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 and Barney get an opportunity to run their own bar during a historic blizzard, while Marshall and Lily try to defy the odds and continue one of their cherished traditions.
Robin needs to find a television job in seven days or else she loses her work visa, and Barney volunteers to come to her aid. Meanwhile, Ted, Marshall, and Lily consider cleaning up their resumes
The guys find out that Barney is pretending to have a wife and son to make his mother happy, but the charade is blown when Ted makes a move on Barney's "wife."
Ted meets with his ex-girlfriend from college--a girlfriend who cheated on him constantly and Marshall and Lily can't stand, and Marshall tells the story about how he forgot to bring his pants to work.
Ted becomes angry with Lily when he finds out that she has been sabotaging all his relationships that she did not approve of, including his relationship with Robin.
Barney and Marshall don't tell Ted that the plans for the building he has been working on have been scrapped, and the guys try to figure out which Canadian celebrity Robin slept with.
Barney tries to do all the items on Ted's "I'm too old for this stuff" list while Marshall's over-competitive side comes out when he coaches Lily's kindergarten basketball team.
Ted's plans to make his own design firm in his apartment hit a snag when his personal assistant begins sleeping with Robin, and Marshall tries to find a way to make himself indispensable at his workplace.
While Ted struggles with an unorthodox architecture project, Robin finds out that Barney is in love with her, and Marshall threatens to take a long-considered leap from the roof to a neighboring building.
