Marshall and Lily make a secret pact to start trying to have a baby if they ever finally see Barney's doppelganger. Meanwhile, Robin finally gets an offer for her dream job.

When Ted takes a date to see a new hit movie, "The Wedding Bride," he is shocked to learn the story is loosely based on his life, and that it was written by Tony, the man Stella left him for at the altar.

When Ted, Marshall, Lily and Barney crash a highfalutin party at a swanky New York apartment, Ted gets the chance to mingle with the snooty guests and show off his intellectual side.

When Ted and Barney jeopardize Robin's new relationship by professing their love for her, Robin realizes that she is finally over them. Meanwhile, after spending a weekend sleeping in twin beds, Marshall and Lily decide to get twin beds at home.

When Ted attends his mother's wedding, he is extremely disturbed by her overly affectionate relationship with her fianc, which forces him to think about his own life and make an impulsive decision.

When Marshall gets mugged, Lily decides she wants to get a gun for protection, so Marshall comes up with a convoluted story about the mugging to deter Lily from following through.

When Ted ruins Lily's birthday dinner celebration by bringing a date, Lily goes to great lengths to keep her out of the traditional photo she takes every year of the gang.

Robin consults a self-help guru to help resolve her anger towards Barney and his behavior during their break-up.

The rest of the gang hopes to make Ted realize he's being strung along by his latest girlfriend, remembering their own similar situations in the process.

Marshall and Lily set up Ted with one of Barney's discards as a Valentine's Day date. Meanwhile, Robin's invited to a party by a co-worker.

Depressed over their own lousy weeks, the rest of the gang cheer Barney on towards a "perfect week": seven girls in seven days with no rejections.

When Marshall's co-worker kisses him, he can't get Lily to believe it happened. Robin discovers she's the subject of a drinking game.

Barney chooses between wearing suits and sleeping with a sexy bartender. Meanwhile, Ted gets ever closer to meeting "the mother".

The gang tries to kick the smoking habit. Meanwhile, Robin deals with her new co-anchor at Channel 1.

Ted's neighbor Maggie, that he's wanted to date for years, has finally broken up with her boyfriend, putting her back on the market. A letter to himself has Marshall trying to live up to it.

Barney's unhappy after a slap bet is bequeathed to Ted and Robin by Marshall. Lily's long-absent father arrives for Thanksgiving.

Barney dusts off his "playbook" to help him back into the dating scene following his breakup with Robin.

Ted and Marshall turn to Lily to break up Barney and Robin when it's clear they're miserable together.

Barney offers relationship advice that leads to Marshall and Lily having a big fight.

Barney wants Robin to become a U.S. citizen, but she can't seem to let go of her Canadian heritage. Ted and Marshall take a road trip to Chicago, but Lily's decision to join up spoils the fun.

A string of girls fall asleep at Ted's apartment. Their hopeless desire to please makes it hard for Marshall and Lily to double date.

Robin thinks Barney is cheating on her, but learns he's actually getting "Robin 101" classes from Ted.

Ted realizes his blind date is the same girl he had a blind date with seven years prior. Meanwhile, the rest of the gang discover a Lily look-alike at a strip club.

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