第 4 季 共 24 集
播出时间：2008年9月23日
第 1 集 Do I Know You?
播出时间：2008年9月23日
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.
第 2 集 The Best Burger in New York
播出时间：2008年9月30日
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.
第 3 集 I Heart NJ
播出时间：2008年10月7日
When Stella's babysitter cancels, a night out turns into the gang hanging out at her place, and Ted talks up New Jersey... until he learns Stella wants him to move there after marriage.
第 4 集 Intervention
播出时间：2008年10月14日
When Ted is packing his stuff for his move to New Jersey, he discovers that the gang was going to hold an intervention for his engagement to Stella and demands they hold it anyway.
第 5 集 Shelter Island
播出时间：2008年10月21日
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.
第 6 集 Happily Ever After
播出时间：2008年11月4日
A serendipitous meeting with someone from his past has Ted thinking about how he would handle running into someone he would prefer to forget.
第 7 集 Not a Father's Day
播出时间：2008年11月11日
Barney creates a holiday to celebrate not being a father. Meanwhile, Lily and Marshall are considering having a baby, but Lily first wants advice from Ted and Robin.
第 8 集 Woooo!
播出时间：2008年11月18日
A birthday party for one of Lily's co-workers leads to Robin connecting with a group of single partiers known as the "Woo Girls". Ted presents a plan for Goliath National Bank's new HQ.
第 9 集 The Naked Man
播出时间：2008年11月25日
The gang learns a new way to get their dates to sleep with them after Ted walks in on Robin's date sitting naked on the couch.
第 10 集 The Fight
播出时间：2008年12月9日
Ted (to prove he's not a milquetoast) and Barney (to impress Robin) pick a fight with a group of guys sitting in the gang's favorite booth at MacLaren's.
第 11 集 Little Minnesota
播出时间：2008年12月16日
Ted tries to keep his irresponsible sister from hooking up with Barney during her trip to New York, and Robin starts hanging out with Marshall at a bar for Minnesotans, not telling them that she's really Canadian.
第 12 集 Benefits
播出时间：2009年1月13日
Ted and Robin discover that sex with each other solve their fights as roommates, which makes Barney very jealous and angry. Meanwhile, Marshall reveals that he's too embarrassed to use the office bathroom.
第 13 集 Three Days of Snow
播出时间：2009年1月20日
Lily and Marshall try to continue their airport reunion tradition. Barney and Ted offer to keep MacLaren's open during a blizzard so they can meet up with some college girls.
第 14 集 The Possimpible
播出时间：2009年2月3日
Robin, desperate to find a job before she is deported, agrees to let Barney produce a video resume for her.
第 15 集 The Stinsons
播出时间：2009年3月3日
The gang thinks that Barney must have a secret girlfriend after noticing his bizarre behavior.
第 16 集 Sorry, Bro
播出时间：2009年3月10日
Marshall and Lily are less than thrilled when they hear that Ted's college girlfriend (Laura Prepon) has moved to New York.
第 17 集 The Front Porch
播出时间：2009年3月17日
Ted learns that not only did Lily plant another woman's earring in his bed for Karen to find, she has meddled in some of his other relationships as well.
第 18 集 Old King Clancy
播出时间：2009年3月24日
Marshall and Barney lie to keep Ted from finding out the headquarters he'd been hired to design for GNB has been cancelled.
第 19 集 Murtaugh
播出时间：2009年3月31日
When Barney learns Ted has a list of things he thinks the gang is too old to do, he sets out to do every task within 24 hours in order to prove Ted wrong.
第 20 集 Mosbius Designs
播出时间：2009年4月14日
Ted goes out on his own as an architect and hires an intern to help get things started, but the intern gets a little too close to others in the gang.
第 21 集 The Three Days Rule
播出时间：2009年4月28日
Ted breaks one of Barney and Marshall's relationship rules, texting a woman he recently met, so the pair play a joke on Ted by pretending to be the woman.
第 22 集 Right Place, Right Time
播出时间：2009年5月5日
Ted ponders how being in the right place at the right time can impact a person's life; Barney celebrates his 200th female conquest.
第 23 集 As Fast as She Can
播出时间：2009年5月12日
Ted is trying to find a new job, and when an old acquaintance tries to help nothing goes as planned. Barney tries to smooth talk his way out of a ticket.
第 24 集 The Leap
播出时间：2009年5月19日
Ted is trying to keep his architecture firm afloat by doing an all-nighter, but Marshall tries to lure him to the roof for a surprise 31st birthday party, on the fourth season finale.
