Original air date: 09/20/2010 Runtime: 21:34 min. When Ted and Barney argue about who has "dibs" on a hot girl, Ted realizes that she is there with Cindy (guest star Rachel Bilson), 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.
Original air date: 09/27/2010 Runtime: 21:34 min. 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.
Original air date: 11/22/2010 Runtime: 21:34 min. 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.
Original air date: 12/13/2010 Runtime: 21:07 min. When Marshall and Lily receive shocking news, it has a profound effect on the gang and forces them to reexamine their own lives. Meanwhile, Robin gets a new job, Barney discovers the joy of giving on Christmas and Ted begins his duties as Best Man for his old friend
Original air date: 02/07/2011 Runtime: 21:26 min. When Zoey fixes Ted up on a date with her cousin (guest star Katy Perry), The gang resorts to calling her "Honey" after learning how naive she is. Meanwhile, Ted calls an intervention on himself after having an epiphany about his feelings for Zoey, and Barney gets acquainted with Honey in Ted's place.
Original air date: 02/14/2011 Runtime: 21:32 min. Barney declares February 13th "Desperation Day, " a holiday for desperate, lonely, women with low self esteem due to the fact that they are destined to be alone on Valentine’s Day. Meanwhile, Lily surprises Marshall (who is still in Minnesota) for Valentine's Day, Ted and Zoey continue to figure out their relationship and Robin bonds with her single girlfriends.
Original air date: 02/19/2011 Runtime: 21:35 min. After Marshall sees a documentary about garbage, he becomes fixated on saving the environment. Meanwhile, Ted runs into Zoey's ex-husband, The Captain, and Robin forces Barney to admit he has feelings for Nora, The girl who made history as his first Valentine's Day date ever.
Original air date: 04/11/2011 Runtime: 21:31 min. 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.
Original air date: 05/16/2011 Runtime: 21:25 min. Robin and Barney bond when they intervene in Ted's relationship (until they run into Nora), and Marshall and Lily watch a ticking clock as he fears that he soon will be the victim of food poisoning. Meanwhile, Ted performs his Best Man duties at a very important wedding.