Ted convinces Victoria to take a brief detour before they leave together after she leaves her fiancé at the altar, and Barney's engagement to Quinn may be short-lived after she finds about his past relationship with Robin.

Barney's ridiculous pre-nup that he asks Quinn to sign gives the other guys ideas of their own, but the girls find a way to retaliate.

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.

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.

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.

Marshall gets in the doghouse at work after he recommends a friend for a job, Robin helps Barney find a new strip club, and Ted is embarrassed after watching his video diary from college.

While Marshall faces the most important court case of his career against his new arch-nemesis, Brad Morris, the rest of the gang tries to figure out which one was the biggest bad-ass in their youth.

Robin has a plan to get Barney out of her system for good, Ted witnesses Marvin's first crawl while babysitting for Marshall and Lily, and Barney has a new business idea after destroying a beloved tie.

Robin tries to get Barney's "Playbook" out of jealousy over his new girlfriend, Marshall catches his mom having sex with Lily's dad, and Ted tries to get everything back that was borrowed from him and never returned.

Ted wants to rub his new building in the face of an old professor, Barney is the victim of a lengthy jinx, Marshall and Lily run into an annoying old acquaintance, and Robin gets an opportunity to fire Patrice.

Will Ted go to the opening of his new building with Robin as his date, or will he break his promise to Barney and tell her that Barney is proposing to Patrice? Meanwhile, Marshall and Lily have big plans for a rare night out.

Robin's dad denies Barney permission to marry his daughter, Marshall and Lily deal with Marvin's constipation, and why is Ted so dead-set against hiring a band for Barney and Robin's wedding?

Barney convinces Ted to sleep with a 20 year old until Barney learns her identity, Robin discovers that her engagement ring makes her invisible, and a leather cuff improves Marshall and Lily's love life.

Robin's past as a Canadian pop star is revisited when Barney uncovers the lost episode of a music documentary series in which she was featured as Robin Sparkles. Marshall and Lily have some concerns about Ted's latest girlfriend.

Ted's attempt to break up with his crazy new girlfriend does not go as planned, and Robin's fear of holding Marvin leads to an adventure with Mike Tyson.

When Ted receives an unexpected call from The Captain, the gang reminisced about their last awkward encounter with him.

Barney is forced to break out "The Playbook" one final time to keep Ted from getting back together with Jeanette and taking her to his wedding, and Marshall embarrasses Lily at an art exhibition.

It's weeks before Barney and Robin's wedding, and one of the many things they still have to decide is where to live. The one thing Robin insists is that they don't live at Barney's apartment. So it goes on the market. However, Barney doesn't want to sell it to just anyone, but someone who is worthy of what was and will always be in his heart his "Fortress of Barnitude". Robin has a slightly different idea, which isn't as easy to achieve as she would like when she and others learn more and more about with what Barney has equipped his apartment. Meanwhile, Lily hasn't spent much time of late with her family because of her job with The Captain. She seems to be at his beck and call, and doesn't seem to mind. Marshall understands, until it affects a planned evening out. So, Marshall decides to cheat on Lily with someone who Lily knows.

Ted and Barney run into their future selves as they debate whether to go to "Wrestlers vs. Robots," while Robin and Marshall argue over who gets credit for a new drink at McLaren's.

"The Captain" offers Lily a job in Rome, but will she take it? Meanwhile, Ted won't stop raving about the body of Barney and Robin's wedding planner.

Ted and Marshall turn Barney's bachelor party into the worst night of his life, or is that exactly what they want him to believe?

Robin searches for a locket that she buried in Central Park for her wedding, Ted helps Marshall and Lily pack for Italy, and Barney plays laser tag with his future father in law.

As the wedding approaches, Barney and Robin deliberately ruin an obnoxious couple's evening, Marshall and Lily's plans for Italy hit a snag and Ted tells Lily that he's moving to Chicago.