How I Met Your Mother

Season 6

In the sixth-season finale, Ted is the best man at a wedding that changes his life; Marshall fears that he may become the victim of food poisoning; and Barney and Robin bond.

Ted makes a tough decision that has a dramatic impact on his relationship with Zoey.

Ted plans a romantic weekend with Zoey, while Marshall and Barney bicker over the fate of the Arcadian Hotel.

Barney tries to make his life seem more exciting as he bonds with his father (John Lithgow); Robin encounters a guy she likes.

Marshall quits his job at Goliath National Bank to volunteer at an environmental organization; Ted and Zooey continue to butt heads over the future of the Arcadia.

Barney finally meets his dad, Jerry (guest star John Lithgow)

Barney realizes he has heartfelt affection for Nora, and he thinks that something is wrong with him; and Robin dates a guy who acts like a dog.

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.

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

Zoey arranges a date for Ted with her cousin, played by Katy Perry; and Ted realizes he has feelings for Zoey, and tells his friends he needs an intervention

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

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

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.

Ted asks Zoey's husband (Kyle MacLachlan) to hang out; Robin and Marshall decide to spend some time together.

The gang, minus Ted, parties all night with The Blitz (Jorge Garcia), an old friend from college; Ted is forced to spend Thanksgiving with Zoey.

When Barney finds a copy of the kids' show featuring Robin's alter ego, the friends learn more about her past as a performer than they expected.

The gang attends a black-tie fundraiser at the Natural History Museum; Ted meets Zoey's husband, the captain.

When Zoey enrolls in Ted's class, she tries to convince his students to help save the building from being torn down for his project; Marshall and Lily notice Robin marching in the Halloween parade of shame.

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.

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

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.

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

When the gang helps Barney's mother move, they learn that she has lied to him about events throughout his life; Robin oversells Ted to a blind date.

Ted runs into an ex-girlfriend (Rachel Bilson); Robin is upset over Don; Marshall can't stop talking about his desire to start a family.