Marshall is partying in Atlantic City with Barney when Lily goes into labor, so the frantic father-to-be scrambles to get back to New York in time for the birth. Meanwhile, Robin and Ted try to distract Lily from her painful contractions.

Marshall freaks out when he realizes that fatherhood is staring him in the face. Meanwhile, Robin and Ted come to an understanding about their relationship.

With Ted settled in a new apartment, Barney decides they should be bros-about-town and go out every night. Meanwhile, Lily has a risqué dream about someone other than Marshall; and Robin’s career hits a high point.

Speculations run wild as Ted, Barney and Marshall imagine what their lives will be like three years down the road.

The gang try to break up Barney and Quinn after learning that the couple plan to move in together. Meanwhile, Ted and Robin argue over subletting her apartment.

Despite the bare facts being revealed about Quinn’s exotic profession, Barney realizes he has feelings for the young lady and sets out to win her over. Meanwhile, Lily and Marshall welcome Robin to the suburbs and Ted wonders what to do about Robin’s empty room.

Ted rocks Robin with a personal declaration about how he feels about her. Meanwhile, Barney tries to dig up some personal dirt on Lily and Marshall.

While joining Lily and Marshall on a Valentine’s Day getaway to Vermont, Robin and Kevin entertain the notion of taking their relationship to another level. Meanwhile, a blind date provides Barney with an eye-opening revelation.

Lily asks for her father’s help when she and Marshall decide to throw a housewarming party; Marshall’s boss gets under Ted’s skin and the two nearly come to blows; and Barney puts the moves on a wacky divorcée.

Lily and Marshall’s official move to the suburbs hits a snag when her pushy father flat-out refuses to move out of their new digs. Meanwhile, Ted, Barney and Robin deal with their friends’ exodus from the city by hitting a strip club.