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