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

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

In an attempt to deliver a devastating final slap to Barney, Marshall explains how he mastered the Slap of A Million Exploding Suns.

Barney concocts a plan when his father arrives at the hotel; Ted thinks he is being framed when a wedding-related duty gets messed up.

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

Barney is upset after Robin wins James's wedding ring during the poker game, and Ted argues with Marshall and Lily over whether he gave them a wedding gift.

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.

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

When Lily and Marshall have trouble finding a nanny, they learn it’s because of an elaborate scheme Barney came up with to meet girls. Meanwhile, Robin and Ted butt heads over who has a more serious relationship.

Marshall recommends his old law school classmate Brad for a job at his firm, but the interview goes awry, leaving Marshall to do damage control with his boss. Meanwhile, Robin helps negotiate Barney’s return to the strip club circuit.

When The Captain asks Lily to move to Rome for a year as his art consultant, she fears that Marshall will resent her. Meanwhile, Ted and Barney become obsessed with a girl who is hiding her amazing body under a puffy coat.

While Barney works through his anger at Ted after finding out he still has feelings for Robin, Marshall Skypes in to act as a judge and help settle their dispute. Meanwhile, Lily realizes she is Robin’s only girlfriend.

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.

Marshall decides to step in after seeing his boss's approach to settling with a million dollar company. Ted's class trip isn't what he envisioned.

Lily asks for her father's help when she and Marshall decide to throw a housewarming party. Marshall's boss gets under Ted's skin and the two nearly come to blows, and Barney puts the moves on a wacky divorcée.

When Barney designs an extensive pre-nup, the guys take note and propose their own relationship amendments to their significant others. Meanwhile, Quinn is outraged and draws up a pre-nup of her own, which causes friction between the sexes.

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.

Marshall takes on his old friend/new nemesis Brad in the biggest case of his career. Meanwhile, the gang reminisces about their own run-ins with the law, leading to a debate over who was the biggest delinquent as a teenager.

Robin is determined to get Barney back no matter what it takes. Meanwhile, Ted fills in as Marvin’s Nanny, leading Marshall and Lily to realize that Ted is using baby Marvin to replace his other baby, the GNB building.

When Ted finds himself with three prospects to be his date for the wedding weekend, he chooses poorly. Meanwhile, Barney and Robin have a confrontation with their minister, and Marshall learns more about his driving companion, Daphne.

Marshall and Barney lie to keep Ted from finding out the headquarters he'd been hired to design for GNB has been cancelled.

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.

When Marshall gets mugged, Lily decides she wants to get a gun for protection, so Marshall comes up with a convoluted story about the mugging to deter Lily from following through.

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.

When Robin is hesitant to break up with Nick, Barney takes matters into his own hands. Meanwhile, Lily and Marshall are desperate for some private time.