When Ted's best friend Marshall proposes to his girlfriend, Lily, Ted realizes he'd better get a move on if he hopes to find true love. Ted soon meets Robin in a neighborhood bar, immediately becomes smitten and scores a first date. But when Ted can hardly wait to see her again, his eagerness threatens to scare her away.

In a desperate attempt for a second date, Ted invites Robin to a party he is throwing. However, she doesn't show up and he keeps throwing parties in the hopes she will finally arrive.

Ted agrees to let Barney spice up his love life, and ends up on a crazy adventure of flying to Philadelphia, encountering the law and visiting the Liberty Bell.

Ted's outlook on his continuing search for love is altered when he rediscovers a shirt that has not seen daylight in years. Meanwhile, Barney amuses himself by coaxing Robin into sacrificing her job by saying completely outlandish things on air live for a cash reward.

Ted and Barney start checking out the club scene with their friend Robin, whereas Lily and Marshall try to participate in some more "grown-up" activities, as they draw slowly nearer to their wedding.

Ted makes his yearly pilgrimage to the rooftop Halloween party in search of a girl dressed as a pumpkin who he met years ago. Meanwhile, Robin is dumped after driving her new boyfriend away with her independent ways.

When a matchmaker with a 100% success rate turns Ted away because he is not compatible with any of the available women in her database, he is still determined that he is going to find his match. After getting information from the matchmaker’s computer, Ted pays a visit to a very cute, but taken, dermatologist in an effort to prove the prediction wrong that there are no women out there for him. Meanwhile, Marshall and Lily are obsessed with ridding their apartment of a critter.

As Lily becomes more of a permanent fixture in the apartment, Ted feels like he is being edged out of the mix by his engaged roomies. Petrified of being left alone and homeless, Ted tells Marshall that when he and Lily are married, he wants the apartment. The problem is that Marshall wants to keep the place too, so they settle it like real "grown-ups" -- launching into a sword fight that leaves one man down for the count.

Ted and Robin are surprised to run into Barney when they volunteer at a homeless shelter on Thanksgiving. Lily is on the brink of freaking out when she goes to Thanksgiving dinner at her future in-laws house.

Ted rents a limo to take the gang out to sample five New Year's Eve parties in a quest to find the perfect celebration.

The gang tries to help Marshall get over Lily, especially when he finds a credit card bill that leads to a hotel in New York City where some of her charges are listed.

Robin wants to tell Ted that she loves him, but she can't tell him. Meanwhile, her sister visits and brings her boyfriend, and Robin doesn't know how to react when her sister says she's ready to lose her virginity.

When a funeral conflicts with the Super Bowl, the gang vows to avoid hearing the score and watch it together on Monday. This proves difficult, as Marshall is threatened with the score by a boy in Lily's class, while doing the news puts Robin in danger of finding out who won.

Ted can't seem to catch a flight to interview for his dream job and he and Robin contemplate why. The story unfolds backwards as they think about it they remember when Robin and Lily went hunting for a wedding dress and when Barney got stuck on the subway.

Robin shows up with a date and this motivates Ted to 'get back out there'. We also learn something major about 'the Mother'.

Ted's new attitude attracts women in the present and one from his past. The rest of the gang pulls together to help him make the most of the situation.

Marshall and Lily's plan to buy an apartment is hampered by mistakes and Lily's hidden debt.

Marshall awaits his bar exam results; Ted introduces his latest girlfriend to the gang, who all see the flaw that Ted has missed

When Barney loses his way with women, he hopes a trip to the Victoria's Secret Fall Fashion Show will help him regain his form.

Ted lives like there's no tomorrow during a St. Patrick's Day celebration with Barney. Lily and Marshall spend the evening at their new apartment with Robin.

After Marshall witnesses a work buddy get yelled at after handing in a report, he becomes paranoid that the same will happen to him.

Robin's musical past emerges again as the group learns of someone named Simon from Robin's past. Barney searches for more Robin Sparkles memorabilia.

Barney and Marshall have a discussion about "The Bro Code" because Barney has broken it and wants advice.

Barney gets a new wingman and Ted meets Stella's daughter.

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.

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.

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.

Ted ponders how being in the right place at the right time can impact a person's life; Barney celebrates his 200th female conquest.

When Robin fears that Barney is cheating on her, she soon discovers that he is spending his evenings with Ted learning everything there is to know on how to date her.

Lily comes up with a perfect plan to break up the relationship between Barney and Robin when they have a rough patch, but she needs help from Robin's famous friend, Alan Thicke, in order to make it work.

When Marshall picks up smoking again, it prompts Lily, Ted and Barney, ex-smokers all, to succumb as well. Meanwhile, Robin gets a new co-anchor at her show...

When Barney debates giving up wearing suits in order to land a hot bartender, his conflicted feelings lead to an amazingly awesome musical number. Meanwhile, Ted gets one step closer to meeting the future mother of his kids.

When Lily refuses to believe that Jenkins, Marshall's attractive female colleague, kissed him, Marshall insists Jenkins tell Lily what really happened. Meanwhile, Robin finds out that a drinking game has been made up about her.

When Barney is about to complete the perfect week - landing seven different girls in seven days - the gang roots him on in order to forget about their own miserable week.

When the gang tries to convince Ted that he is being strung along by Tiffany, they reflect about relationships where each of them has been in the same situation.

When Ted attends his mother's wedding, he is extremely disturbed by her overly affectionate relationship with her fiancé, which forces him to think about his own life and make an impulsive decision.

Marshall and Lily make a secret pact to start trying to have a baby if they ever finally see Barney's doppelganger. Meanwhile, Robin finally gets an offer for her dream job.

When Ted and Barney argue about who has "dibs" on a hot girl, Ted realizes that she is there with Cindy, a girl he previously dated who is also the roommate of his future wife. Meanwhile, Robin is heartbroken over Don, and Marshall can't keep quiet about his desire to start a family.

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

Barney's discovery of a Canadian kids show called Space Teens, that Robin appeared on as Robin Sparkles, leads the gang to get her to reach out to her co-star, Jessica Glitter.

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.

When Ted's new friendship with Zoey tests the theory that single men and married women can't be friends, he invites her husband, "The Captain," to hang out with them. Meanwhile, Marshall and Robin decide to spend alone time together, and Barney and Lily possibly have a fight.

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

When Barney starts to have real feelings for Nora, he worries that something is wrong with his heart. Meanwhile, Robin starts dating a guy who acts a lot like a dog.

Barney meets his father and is shocked by the differences in their lives. The rest of the gang learn their "gaps"; knowledge they should have by now, but don't.

While Barney prepares for his wedding to a mystery bride, he and Ted reminisce about Punchy’s wedding, including when Marshall and Lily announced they are having a baby. Meanwhile, Robin considers telling Barney she has feelings for him.

Marshall gets a great job offer that he fears may be scuttled by a social media background check. Ted needs a date for the Architects Ball.

Ted finally meets his mystery girl in the Slutty Pumpkin costume. Meanwhile, Barney learns he is part Canadian, and Lily has pregnancy brain.

Ted and Barney discuss making a life-changing decision together, and Robin tries to discourage Marshall and Lily from moving to Long Island.

When Robin breaks up with Kevin, Ted confesses his feelings to her. Meanwhile, Barney is on a mission to find something private of Marshall and Lily’s.

Barney continues his pursuit of Quinn. Ted has to deal with Robin's old room, while Robin gets a taste of suburban life from Marshall and Lily.

The gang tries to break up Barney and Quinn after learning they plan on moving in together, leaving Robin and Ted to fight over who deserves to sublet her apartment.

When Lily goes into labor, Ted and Robin distract her by telling her stories while Marshall hurries back from Atlantic City.

When Lily and Marshall can’t decide on godparents for Marvin, they put the gang to the test to see who would make the best one.

As the season of break-ups continues, Ted and Victoria must choose the next step in their long and complicated relationship. Meanwhile, Robin worries about Barney when he chooses a dog to be his wingman.

Ted is reluctant to break up with his crazy girlfriend Jeanette. Meanwhile, Robin becomes attached to Marvin after finally holding him for the first time.

Ted and Barney's future versions attempt to persuade present day Ted to go see Robots Versus Wrestlers. Marshall and Robin have a dance-off.

As the gang prepares to go to Robin and Barney’s wedding, Ted invites Lily to see the house he's finally finished fixing up. Meanwhile, Robin and Barney’s night of relaxation is ruined by an obnoxious couple, and Marshall takes the baby on a last-minute trip to Minnesota to see his family.

When Daphne sends a troubling text message to Lily, Marshall enlists the gang's help to remove the message while enforcing the "No Questions Asked" rule.

When Robin and Loretta's conflict escalates, Barney is caught in the middle. Meanwhile, Marshall and Daphne deal with a stowaway on their road trip, and Ted and Cassie try to enjoy a trip to a lighthouse.

Marshall tries to get Marvin to sleep by reciting rhyming bedtime stories.

The gang must figure out how to make the Stinson Hangover Fixer Elixir to help Barney recover on the day of the wedding.

Marshall asks Barney and Ted for help figuring out where Lily went in the middle of the night during their argument.

With only a half an hour left before the wedding, Robin and Barney panic; Lily and Marshall rewrite their wedding vows.

Ted finally finishes telling his kids the story of how he met their mother.