Aired: 5/24/2010 | Doppelgangers

Lily and Marshall decide that if they see a double of Barney that it’ll be their sign to try to get pregnant. Robin gets the job offer she’s always wanted.

Aired: 5/17/2010 | The Wedding Bride

Ted discovers the date movie he sees with a girl is based on his relationship with Stella.

Aired: 5/10/2010 | Robots Vs. Wrestlers

Crashing a snobby high-society party allows Ted to show off how pretentiously intellectual he can be.

Aired: 5/3/2010 | Twin Beds

A weekend away having to sleep in twin beds makes Marshall and Lily realize they might help their home life. Both Ted and Barney tell Robin they’re still in love with her.

Aired: 4/19/2010 | Home Wreckers

Ted’s repulsed when he sees how affectionate his mother is with her fiancé at their wedding.

Aired: 4/12/2010 | Zoo or False

Marshall’s mugging leads to Lily thinking a gun will solve her safety worries—and to him trying to come up with a way to stop her.

Aired: 3/22/2010 | Say Cheese

Lily’s furious when Ted brings a date to her birthday dinner.

Aired: 3/8/2010 | Of Course

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

Aired: 3/1/2010 | Hooked

The rest of the gang hopes to make Ted realize he’s being strung along by a girl named Tiffany, remembering their own similar situations in the process. Meanwhile, Barney’s thrilled when he learns she’s a pharmaceutical sales rep, the current ‘hot girl’ occupation.

Aired: 2/8/2010 | Rabbit or Duck

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.

Aired: 2/1/2010 | The Perfect Week

Depressed over their own lousy weeks—Marshall and Lily were outed as toothrush sharers, Ted mistook a student’s name for a gag, and a guy won’t call Robin for a second date—the rest of the gang cheer Barney on towards a “perfect week”: seven girls in seven days with no rejections.

Aired: 1/18/2010 | Jenkins

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.

Aired: 1/11/2010 | Girls Vs. Suits

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

Aired: 12/14/2009 | Last Cigarette Ever

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

Aired: 12/7/2009 | The Window

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.

Aired: 11/23/2009 | Slapsgiving 2: Revenge of the Slap

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

Aired: 11/16/2009 | The Playbook

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

Aired: 11/9/2009 | The Rough Patch

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

Aired: 11/2/2009 | Bagpipes

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

Aired: 10/19/2009 | Duel Citizenship

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.

Aired: 10/12/2009 | The Sexless Innkeeper

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.

Aired: 10/5/2009 | Robin 101

Robin thinks Barney is cheating on her, but learns he’s actually getting “Robin 101″ classes from Ted. Marshall tries to give away his barrel, Mabel, by leaving it on the sidewalk, but is miffed that no one seems interested.

Aired: 9/28/2009 | Double Date

Ted realizes his blind date is the same girl he had a blind date with seven years prior, and they use the opportunity to try to learn what they do wrong on first dates. Meanwhile, Barney and Marshall discover a Lily look-alike at a strip club—the “third doppelgänger” for a member of the gang they’ve found so far.

Aired: 9/21/2009 | Definitions

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

Aired: 5/18/2009 | The Leap

As his 31st birthday nears, an all-nighter to try to get business has Ted realizing he may need to pursue another career than architecture. Meanwhile, Marshall tries to get him up to a rooftop surprise party.

Aired: 5/11/2009 | As Fast As She Can

Ted continues trying to land a client for Mosbius Designs, and when Tony tries to help nothing goes as planned—for either of them. Barney tries to smooth talk his way out of a ticket.

Aired: 5/4/2009 | Right Place Right Time

Ted explains to his future kids how a series of unrelated events led to a chance encounter with a former girlfriend. Barney makes the 200th notch in his bedpost. Marshall goes overboard when he discovers GNB has a department that can make him charts and graphs.

Aired: 4/27/2009 | The Three Days Rule

When Ted violates the ‘three days rule’ by continually texting with a girl he’s just met, Barney and Marshall retaliate by impersonating her.

Aired: 4/13/2009 | Mosbius Designs

Ted goes out on his own as an architect and hires an intern to help get things started, but all he helps himself to is Robin. Meanwhile, news of impending layoffs at GNB has Marshall looking for a schtick to make him indispensible.

Aired: 3/30/2009 | Murtaugh

Barney attempts to complete in a single day all the tasks from a list Ted made to prove the gang’s not too old to do them. Meanwhile, he challenges Ted to complete a list of things they’re too young to do yet.

Aired: 3/23/2009 | Old King Clancy

Marshall and Barney lie to keep Ted from finding out the headquarters he’d been hired to design for GNB has been cancelled. The gang try to decipher the story of a celebrity encounter Robin once had.

Aired: 3/16/2009 | The Front Porch

Ted is shocked to learn that Lily is responsible for many of his breakups with ex-girlfriends-including Karen. Meanwhile, Marshall defends his wearing of a nightgown to bed.

Aired: 3/9/2009 | Sorry, Bro

Ted’s college girlfriend reenters his life and leaves Marshall and Lily remembering how much they hated her, while Barney tries to steer the storytelling towards Marshall’s forgetting his pants at work that day.

Aired: 3/2/2009 | The Stinsons

Suspecting he has a secret girlfriend, the gang follows Barney when he leaves MacLaren’s and discovers he seemingly has been keeping a family secret from them.

Aired: 2/2/2009 | The Possimpible

Robin relies on a video résumé prepared by Barney to land a job in broadcasting before facing deportation back to Canada. Marshall suffers from ‘dancer’s hip’.

Aired: 1/19/2009 | Three Days Of Snow

A blizzard hits New York City, threatening a tradition of Marshall and Lily’s and leaving Ted and Barney to keep MacLaren’s doors open.

Aired: 1/12/2009 | Benefits

Robin and Ted explore “friends with benefits” while living together. Marshall has trouble with a few reality TV stars.

Aired: 12/15/2008 | Little Minnesota

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

Aired: 12/8/2008 | The Fight

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.

Aired: 11/24/2008 | The Naked Man

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.

Aired: 11/17/2008 | Woooo!

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.

Aired: 11/10/2008 | Not a Father’s Day

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.

Aired: 11/3/2008 | Happily Ever After

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.

Aired: 10/20/2008 | Shelter Island

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

Aired: 10/13/2008 | Intervention

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.

Aired: 10/6/2008 | I Heart NJ

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.

Aired: 9/29/2008 | The Best Burger in New York

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

Aired: 9/22/2008 | Do I Know You?

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

Aired: 5/19/2008 | Miracles

Ted is in a car accident that prompts Marshall to talk about miracles. Everyone flashbacks to prior moments in their lives.