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Ted musters up the courage to talk to a girl at the bar, but then discovers she's there with one of his exes. Meanwhile, Lily is mad at Marshall because he told his dad they're trying to have a baby, and Robin lets herself go.

The gang accompanies Barney and his brother James after they find the man who may be Barney's father, but it turns out to be James' father instead.

When Ted declines Barney's offer to design the new GNB building, Barney ties to woo him by using all of his best womanizing tactics. Meanwhile, Robin is still not over her relationship with Don and drunk dials him.

The guys race each other, each using a different form of transportation, from the pub to a restaurant seven miles away because a friend claims that Woody Allen is there.

Is Ted having second thoughts about designing GNB's new skyscraper because it would tear down a landmark, or because he's trying to impress a woman? Meanwhile, Lily shares a secret about Robin's new boyfriend with Marshall.

Marshall takes steps to make sure that he and Lily have a baby boy, but Lily has other ideas. Meanwhile, when Ted begins dating Robin's co-anchor, Barney is inspired to use baby talk to pick up women, and Robin feels betrayed.

Marshall struggles to fire an incompetent employee, everyone tries to figure out whom Robin slept with Halloween night, and Zoey, the GNB skyscraper protester, finds a way to turn Ted's class against him.

Ted and Zoey's feud continues during a fundraiser at the Museum of Natural History. Meanwhile, Marshall confesses to Lily that he enjoys his job at GNB, and a prank by Barney and Robin may lead Barney to his real father.

While Barney finds a new video from Robin's Canadian teen star past, Lily fears that a baby could come between her friendship with Robin. Meanwhile, Ted's obnoxious old friend, 'Punchy,' comes from Cleveland for a visit.

When Ted leaves the bar early to prepare a Thanksgiving feast for his friends, the gang winds up partying all night with The Blitz, an old friend from college who has bad luck. As a result, Ted is forced to spend Thanksgiving with Zoey.

Ted goes on a boating trip with Zoey's husband, 'The Captain.' Menawhile, Barney's 'Mermaid Theory' prevents Marshal from having a nice dinner with Robin, and the narrator tries to recall the details of a fight between Lily and Barney.

Barney and Robin contemplate drastic positive changes in their lives when Marshall and Lily announce that Lily is pregnant, but renege on their promises when Marshall and Lily tell them that it was a false positive.

Marshall suspects that he is the reason Lily can't get pregnant after meeting a fertility doctor who also happens to be Barney's doppelganger. Meanwhile, Robin's embarrassing past is revealed at work by her former co-anchor.

The gang tries to support Marshall and Lily tries to help his mom during Marshall's father's funeral, but Marshall becomes preoccupied when he discovers that he has one final voicemail message from him.

Ted discovers that he is in love with Zoey after she tries to set him up on a date with her naive cousin, and he cuts off their friendship as a result. But little does he know that her marriage status has changed and she loves him too.

Lily goes to Minnesota to bring Marshall back, but he's not ready to leave yet. Meanwhile, Ted and Zoey's relationship gets off to a rocky start, and Barney searches for a female 'victim' the night before Valentine's Day.

The Captain asks Ted to help find out who stole Zoey away from him, Marshall withholds sex until he does something to help the environment, and Barney is reluctant to admit that he has a crush on Robin's friend.

The gang gets mad at Barney when he lies to Nora and says he wants to get married and have a family to impress her, and Robin begins dating a guy who seems to possess several canine characteristics.

Barney finally meets his biological father, but is disappointed to discover that he leads a boring life and is nothing like him.

Despite Zoey still opposing the new GNB headquarters being built on the Arcadian Hotel site, Ted and Zoey's personal relationship is thriving. That issue is only one of the many disagreements in their life, which Ted likens to the two challenging each other mentally. On the other hand, he sees Marshall and Lily's relationship as being boring, as they agree on everything to the point of them almost melding into one person. Lily and Marshall, on the other hand, see their relationship as being supportive, the way that relationships should be, whereas they see Ted and ..

When Barney tries to bond with his father, he asks the gang to help make his life seem more exciting by lying about their own lives. Meanwhile, Robin runs into a guy she has a crush on.

When Marshall switches sides on the Arcadian dispute, his friendship with Barney is compromised and the gang is banned from the bar. Meanwhile, Ted finally finds the courage to confront Zoey about the same topic.

Ted is forced to make the final decision on whether he thinks The Arcadian should be declared a landmark, and his future with Zoey and Barney's future at GNB hinge on his decision.

In the aftermath of Ted and Zoey's break-up, Ted is having second thoughts. He is freaking out about an issue with the GNB headquarters, and historically when Ted freaks out about something, he turns to dating an old girlfriend if only for something comfortable and familiar, however bad returning to that relationship ended up being. When Barney and Robin find out that Ted is going to meet Zoey to get back together with her, they have to try and figure out where that meeting place is so that they can stop him. Beyond piecing together this puzzle, Barney and Robin's ..

Marshall becomes predictably depressed and pathetic after the breakup. And it only gets worse when he discovers that Lily may be back in town.

Barney gets Marshall back out on the singles market, but Barney keeps taking all the prospects from him. And Ted's convinced that Lily is back because she wants Marshall back, even though she says she's never been better.

Ted discovers that his parents are keeping a secret from him after his dad acts as Barney's wingman, and Marshall and Lily intentionally try to get each other sexually aroused.

Barney tells Ted that single women like architects. But will Ted use this useful tidbit of information to cheat on Robin after they have their first fight?

Lily gets introduced to Barney's bachelor pad when she needs a place to stay, and Marshall finds a unlikely new friend to join him for brunch, concerts and musicals.

Ted gets Lily a job at his firm, but she only makes trouble for Ted when he refuses to stand up to his boss. And Barney sleeps with Marshall's law school professor to help his grades, but she's less than impressed with his prowess.

The guys tell Marshall to stay away from his new date because she has 'crazy eyes,' but she couldn't be any crazier than Lily after she learns that Marshall's going out on his first new date.

Marshall and Lily elope to Atlantic City, but they discover that getting married in Atlantic City isn't as easy as getting married in Las Vegas.

The gang discovers that Robin's been hiding a huge secret, but they have no idea what it is. Marshall thinks she is married, and Barney thinks she was a porn star.

Barney's gay black brother is in town, but he doesn't want to tell Barney that he's getting married because he'll be losing his only single sidekick.

Lily takes away her Christmas display after she finds out that Ted called her a bad name while she was broken up with Marshall, and Barney is too sick for his Christmas plans.

Robin tries to keep her younger sister from losing her virginity while on vacation in New York, which causes everyone to reminisce about their first times.

Barney asks Lily to paint a nude picture of him after finding her painting of Marshall. And Ted can't find an opportune time to fire his old boss, who now works for him but still keeps undermining his work.

Everybody misses the Super Bowl because of a funeral. Therefore, they all try to go 24 hours without finding out who won so that they can watch the game together on Monday night.

When Ted misses his important business trip to Chicago, he tries to trace his steps back to the original incident that triggered the series of events that made him miss the flight.

Ted tries to get rid of everything he received from other women at Robin's request, but getting rid of the stuff Robin received from other men won't be as easy. Meanwhile, Barney gets revenge on Lily for making him attend her terrible play.

When Marshall's car doesn't quite make it to 200,000 miles without dying completely, everybody reminisces about their greatest memories with the car.

Ted and Robin decide to move in together, but nobody appears to be happy with the new living arrangements--especially Barney.

Ted changes Barney's bachelor party plans for Marshall at the last minute, so that it won't just consist of gambling and cheap strippers. And Robin gets Lily an inappropriate shower party gift.

Barney becomes a contestant on 'The Price Is Right' so that he can confront Bob Barker, because he believes that the game show host is his biological father.

Marshall and Lily's wedding is destined to become a disaster, until fate intervenes and makes it perfect.

As the happy couple celebrate their wedding, Ted and Robin tell Barney about the latest development of their relationship.