E1 - Big Days

Aired: September 20, 2010

When Ted and Barney argue about who has "dibs" on a hot girl, Ted realizes that she is there with Cindy, a girl he previously dated who is also the roommate of his future wife. Meanwhile, Robin is heartbroken over Don, and Marshall can't keep quiet about his desire to start a family.

E2 - Cleaning House

Aired: September 27, 2010

When Barney convinces the gang to help his mom move out of her home, they quickly learn that she has been very protective of Barney and lied to him about events throughout his life. Meanwhile, Ted gets upset when Robin oversells him to a blind date.

E3 - Unfinished

Aired: October 04, 2010

Barney uses his best womanizing tactics to try to convince Ted to design the new GNB building; Robin drunk dials Don.

E4 - Subway Wars

Aired: October 11, 2010

When the gang teases Robin about not being a real New Yorker, she sets out to prove them wrong by racing to catch a glimpse of Woody Allen.

E5 - Architect of Destruction

Aired: October 18, 2010

Ted becomes conflicted after meeting an attractive woman who is passionate about saving the landmark building being torn down for his new project.

E6 - Baby Talk

Aired: October 25, 2010

Marshall and Lily try to figure out how to conceive a baby with the gender of their choice; Robin's perky new co-anchor irritates her.

E7 - Canning Randy

Aired: November 01, 2010

When Zoey enrolls in Ted's class, she manipulates his students into taking her side in the fight to save the building being torn down to make room for his project. Meanwhile, Marshall and Lily spot Robin marching in the Halloween parade of shame.

E8 - Natural History

Aired: November 08, 2010

When the gang goes to a black tie event at the Natural History Museum, Ted gets introduced to Zoey's husband, The Captain.

E9 - Glitter

Aired: November 15, 2010

Barney's discovery of a Canadian kids show called Space Teens, that Robin appeared on as Robin Sparkles, leads the gang to get her to reach out to her co-star, Jessica Glitter.

E10 - Blitzgiving

Aired: November 22, 2010

When Ted leaves the bar early to prepare a Thanksgiving feast for his friends, the gang winds up partying all night with The Blitz, an old friend from college who has bad luck. As a result Ted is forced to spend Thanksgiving with Zoey.

E11 - The Mermaid Theory

Aired: December 06, 2010

When Ted's new friendship with Zoey tests the theory that single men and married women can't be friends, he invites her husband, "The Captain," to hang out with them. Meanwhile, Marshall and Robin decide to spend alone time together, and Barney and Lily possibly have a fight.

E12 - False Positive

Aired: December 13, 2010

Lily and Marshall receive shocking news that has a profound impact on the gang. Ted begins his duties as best man for an old friend's wedding.

E13 - Bad News

Aired: January 03, 2011

Afraid they will never get pregnant, Lily and Marshall decide to see a specialist. Robin begins her new job.

E14 - Last Words

Aired: January 17, 2011

While on a trip to Minnesota, Ted and Barney try anything to make Marshall laugh. Marshall runs into an old nemesis from high school.

E15 - Oh Honey

Aired: February 07, 2011

Barney gets emotional when he opens up to Honey about his life. Ted admits to having feelings for Zoey to the group.

E16 - Desperation Day

Aired: February 14, 2011

Barney declares February 13th a holiday for desperate women. Marshall receives a Valentine's Day surprise from Lily. Zoey and Ted work on figuring out their relationship.

E17 - Garbage Island

Aired: February 21, 2011

Marshall becomes obsessed with saving the environment after seeing a documentary on garbage. Ted runs into The Captain. Barney admits he has feelings for a woman.

E18 - A Change of Heart

Aired: February 28, 2011

When Barney starts to have real feelings for Nora, he worries that something is wrong with his heart. Meanwhile, Robin starts dating a guy who acts a lot like a dog.

E19 - Legendaddy

Aired: March 21, 2011

Barney meets his father and is shocked by the differences in their lives. The rest of the gang learn their "gaps"; knowledge they should have by now, but don't.

E20 - The Exploding Meatball Sub

Aired: April 11, 2011

Lily and Barney react badly when Marshall finally quits his job at Goliath National Bank to take a volunteer position at an environmental organization. Meanwhile, Ted and Zoey's opposing positions on the future of the Arcadia come between them.

E21 - Hopeless

Aired: April 18, 2011

When Barney tries to bond with his father, he asks the gang to help make his life seem more exciting by lying about their own lives. Meanwhile, Robin runs into a guy she has a crush on.

E22 - The Perfect Cocktail

Aired: May 02, 2011

When Marshall and Barney argue over the destruction of the Arcadian Hotel, Robin and Lily try to mix the right combination of cocktails that will force them to make up. Meanwhile, Ted plans a romantic weekend away with Zoey.

E23 - Landmarks

Aired: May 09, 2011

When Ted is faced with an important decision that might affect his future with Zoey, the gang expresses their true feelings about her.

E24 - Challenge Accepted

Aired: May 16, 2011

Robin and Barney bond when they intervene in Ted's relationship, and Marshall and Lily watch a ticking clock as he fears that he soon will be the victim of food poisoning.