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- Season 6 overviewSep 20, 2010-May 16, 201124 episodesSeason 6 episodes1. Big Days Sep 20, 2010
- Ted runs into an ex-girlfriend; Marshall can't stop talking about his desire to start a family.
- 2. Cleaning House Sep 27, 2010
- When the gang helps Barney's mother move, they learn that she has lied to him throughout his life.
- 3. Unfinished Oct 4, 2010
- Barney uses his best womanizing tactics to try to convince Ted to design the new GNB building.
- 4. Subway Wars Oct 11, 2010
- When the gang teases Robin about not being a real New Yorker, she sets out to prove them wrong.
- 5. Architect of Destruction Oct 18, 2010
- An attractive woman is passionate about saving the building being torn down for Ted's new project.
- 6. Baby Talk Oct 25, 2010
- Marshall and Lily try to figure out how to conceive a baby with the gender of their choice.
- 7. Canning Randy Nov 1, 2010
- Zoey tries to convince Ted's students to help save the building from being torn down.
- 8. Natural History Nov 8, 2010
- The gang attends a black-tie fundraiser at the Natural History Museum; Ted meets Zoey's husband.
- 9. Glitter Nov 15, 2010
- Barney finds a copy of the kids' show featuring Robin's alter ego.
- 10. Blitzgiving Nov 22, 2010
- The gang, minus Ted, parties all night with The Blitz, an old friend from college.
- 11. The Mermaid Theory Dec 6, 2010
- Ted asks Zoey's husband to hang out; Robin and Marshall decide to spend some time together.
- 12. False Positive Dec 13, 2010
- Lily and Marshall receive shocking news that has a profound impact on the gang.
- 13. Bad News Jan 3, 2011
- Afraid they will never get pregnant, Lily and Marshall decide to see a specialist.
- 14. Last Words Jan 17, 2011
- While on a trip to Minnesota, Ted and Barney try anything to make Marshall laugh.
- 15. Oh Honey Feb 7, 2011
- When Zoey's naive cousin visits, Barney makes a move on her; Ted faces his feelings for Zoey.
- 16. Desperation Day Feb 14, 2011
- Barney declares February 13th a holiday for desperate women; Marshall receives a surprise.
- 17. Garbage Island Feb 19, 2011
- Marshall becomes obsessed with saving the environment after seeing a documentary on garbage.
- 18. A Change of Heart Feb 28, 2011
- Barney's growing feelings for Nora make him worry about his heart.
- 19. Legendaddy Mar 21, 2011
- Barney meets his father; the gang points out things each of them should know but never learned.
- 20. The Exploding Meatball Sub Apr 11, 2011
- Marshall quits his job at Goliath National Bank to volunteer at an environmental organization.
- 21. Hopeless Apr 18, 2011
- Barney tries to bond with his father; Robin runs into a guy she likes.
- 22. The Perfect Cocktail May 2, 2011
- Lily and Robin try to force Barney and Marshall to make amends after an argument.
- 23. Landmarks May 9, 2011
- Ted must make an important decision; the gang is honest about Zoey.
- 24. Challenge Accepted May 16, 2011
- Marshall fears an impending bout of food poisoning; Ted acts as best man in an important wedding.