"A lot of the decisions came out of necessity, but a lot of them were things that became opportunities. I think the 56-hour issue was the big one. We definitely felt like, for various reasons -- the ages of Ted's kids and things -- Barney and Robin had to get married in May 2013. That was the thing we were stumbling on, and then Craig had the idea of, What if we did a whole season just over the course of the wedding, but use that framework as a springboard to tell stories from 10 years in the future, 10 years in the past, stories at the wedding? Because there are certainly lots of stories to come out of that."
Episode 1: The Locket
On their way to Long Island for their wedding weekend, Robin and Barney come across a startling family discovery. Meanwhile, Marshall sees something online that changes the course of his entire journey back east, and Lily confronts Ted about letting go of Robin.
Episode 2: Coming Back
When James reveals that he is getting divorced, Robin worries about how Barney will take the news. Meanwhile, Marshall races to find a way to get to New York in time for the wedding, and Ted deals with being alone at a romantic hotel.
Episode 3: Last Time in New York
When Lily discovers Ted’s list of things he wants to do in New York before he moves for Chicago, she becomes frustrated that she is the only person who knows about his plans. Meanwhile, Robin and Barney realize they have very little time together before their relatives arrive for their wedding.
Episode 4: The Broken Code
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.
Episode 5: The Poker Game
When Barney is forced to pick sides in a fight between Robin and his mother, Lily coaches him on how not to ruin his relationship. Meanwhile, Ted and Marshall get into a dispute over wedding gifts and thank-you notes.
Episode 6: Knight Vision
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.
Episode 7: No Questions Asked
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.
Episode 8: The Lighthouse
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.
Episode 9: Platonish
In a flashback episode, the gang ponders the future of the Ted, Robin and Barney love triangle. Meanwhile, Barney accepts a series of challenges from Lily and Robin.
Episode 10: Mom and Dad
When Barney’s father arrives at the hotel, Barney devises a plan that makes Robin very nervous. Meanwhile, Ted is convinced someone framed him by messing up a wedding-related duty.
Episode 11: Bedtime Stories
Marshall tries to get Marvin to sleep by reciting three rhyming bedtime tales about his friends as they wind down their epic cross-country journey.
Episode 12: Rehearsal Dinner
Barney becomes fixated on having his rehearsal dinner at a laser tag arena, much to Robin’s dismay. Meanwhile, Ted doesn’t come through on a promise, which aggravates Lily.
Episode 13: Bass Player Wanted
The gang encounters a guy at the wedding who intentionally stirs up trouble among them, and Marshall finally arrives at the Farhampton Inn.
Episode 14: Slapsgiving 3: Slappointment in Slapmarra
In an attempt to deliver a devastating final slap to Barney, Marshall explains how he mastered the Slap of A Million Exploding Suns.
Episode 15: Unpause
When Barney drinks too much, Ted and Robin take advantage of him and get him to reveal secrets he’s been hiding for years. Meanwhile, Marshall does everything he can to avoid fighting with Lily.
Episode 16: How Your Mother Met Me
On the 200th episode, The Mother recounts how she met Ted and what she’s been up to for the past eight years.
Episode 17: Sunrise
While out looking for an inebriated Barney on the day of the wedding, Robin and Ted reminisce about past relationships. Meanwhile, Marshall and Lily finally resolve their issues and Barney befriends two young guys eager to meet women.
Episode 18: Rally
When Barney suffers from the world’s worst hangover the morning of his wedding, the gang tries to figure out the far-fetched ingredients to concoct the Stinson Hangover Fixer Elixir.
Episode 19: Vesuvius
On the morning of the wedding, Lily and Robin have a fight and Barney freaks out about which suit to wear. Meanwhile, the gang watches a movie Ted has forbidden them to see.
Episode 20: Daisy
Marshall enlists Ted and Barney to help him figure out where Lily went when she left in the middle of their fight. Meanwhile, Robin's mother recollects the bad traits in her ex-husband, which are very similar to Barney's traits.
Episode 21: Gary Blauman
When Gary Blauman shows up at the wedding, it sends the gang into a frenzy as they each recall an encounter with him.
Episode 22: The End of the Aisle
With only a half-hour to go, both Barney and Robin have panic attacks about their upcoming nuptials. Meanwhile, Marshall and Lily rewrite their old wedding vows.
Episode 23/24: Last Forever
Ted finally finishes telling his kids the story of how he met their mother.
