Season 4, Episode 1: Do I Know You?

Original Air Date: 22 September 2008

Plot: Ted and Stella get engaged, but Ted soon learns that he doesn't know anything about her. Meanwhile, Barney confesses to Lily that he's in love with Robin.

Season 4, Episode 2: The Best Burger in New York

Original Air Date: 29 September 2008

Plot: Marshall claims that he had the best hamburger in the world during his first week in New York City, but he forgot where the burger joint is located. The gang then hits the streets of Manhattan to help him find it.

Season 4, Episode 3: I Heart NJ

Original Air Date: 6 October 2008

Plot: Ted does not want to move in with Stella because he hates New Jersey. Robin prematurely quits her TV job because she incorrectly thinks that she already has a new job.

Season 4, Episode 4: Intervention

Original Air Date: 13 October 2008

Plot: Ted, Robin, Marshall, and Lily all begin getting cold feet because of their imminent life changes, and Barney tries to prove that he can pick up a woman while posing as an 80-year-old man.

Season 4, Episode 5: Shelter Island

Original Air Date: 20 October 2008

Plot: Ted and Stella move up their wedding date, but the wedding may not go off as planned after Ted breaks the "No Exes Rule" and invites Robin to come in from Japan for the wedding.

Season 4, Episode 6: Happily Ever After

Original Air Date: 3 November 2008

Plot: The gang tries to hide from Stella when they discover that they are eating at the same restaurant.

Season 4, Episode 7: Not a Father's Day

Original Air Date: 10 November 2008

Plot: While Barney celebrates a pregnancy false alarm, Marshall and Lily try to figure out if it's time to have a baby.