Robin’s anxiety on her wedding day to Barney prompts Ted to recount the time he insisted on leaving Victoria’s jilted fiancé a note before they drove off into the sunset together.

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.

莉莉和马修没办法找到合适的保姆，他们发现罪魁祸首竟然是巴尼……巴尼对待女人的方式方法已经对他们造成潜移默化的影响，而这说不定是巴尼精心策划的一个阴谋！与此同时，罗宾和泰德都认为自己对现在的感情很认真，甚至为谁更认真的问题发生争吵。

莉莉和马修开始为马文寻找合适的教父母。他们让身边的这些朋友逐个接受考验，以决定他们当中谁最合适。

分手季节尚未结束，这次轮到了泰德和维多利亚。不过在那之前，泰德和维多利亚不得不思考他们之间复杂的、长期的、反反复复的关系究竟要向何方发展。另一方面，和奎茵分手的巴尼选择一只狗作为自己的伴侣，罗宾不免对他有些担心。

罗宾不敢和尼克分手，巴尼决定自己来掌控一切。与此同时，莉莉和马修渴望能有私密时间。不……不是渴望，是绝望！

马修推荐当年法学院的同学布拉德来他公司工作，但是他面试失败，留下马修一人面对他的老板。同时，罗宾帮助巴尼打理他重回脱衣舞俱乐部的事项。

马修曲折地赢下蛙湖案，并打动布拉德弃恶从善。在布拉德的鼓励下，马修申请成为纽约州法官。巴尼决心放弃罗宾，只做好朋友。

罗宾决定把巴尼追回来，无论发生什么。与此同时，泰德当起马文的保姆，导致马修和莉莉意识到泰德是用马文来替代他的另一个孩子——GNB大楼。

Barney's developing relationship with Patrice leaves Robin questioning his motives. Marshall's widowed mother gets back into the dating pool, but he thinks she may be swimming with a shark.

Robin takes steps to have Patrice fired from WWN, while Marshall puts a jinx on Barney. Later, Ted invites his architecture professor to the dedication of the GNB building, and Marshall and Lily bump into an oddball acquaintance from college.

Christmas approaches and Ted wrestles with whether to tell Robin about Barney's intentions involving Patrice, while Marshall and Lily get an early Yule gift, a night away from Marvin, but a case of separation anxiety strikes and threatens to ruin the evening.

When Robin learns that Barney never asked her father’s permission before proposing, she insists that he seek his approval before announcing their engagement. Meanwhile, Ted keeps his feelings concealed by throwing himself into planning their wedding.

Barney begs Ted to continue seeing his much younger, much wilder girlfriend, even though Ted has nothing in common with her. Meanwhile, Robin must adjust to the power of the bling.

Barney uncovers the lost episode of Robin’s “Underneath the Tunes” as Robin Sparkles. Meanwhile, Marshall and Lily are concerned that Ted’s new girlfriend is a stalker.

泰德犹豫是否要与自己的疯狂女友吉内特分手。与此同时，罗宾在好不容易第一次怀抱马文后，就不愿再松开手。

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

Barney's legendary relationship playbook, which Robin thought was destroyed, rears its head when Ted and Jeanette break up and Barney decides to use his chick manual to help Ted find a new girlfriend.

在罗宾叫巴尼卖掉他的单身公寓去重新构筑新家后，不情愿的巴尼赶走潜在买主。同时，莉莉作为“船长”艺术顾问的繁忙工作让她和马修的关系绷紧。

泰德和巴尼正考虑去不去“机器人大战摔跤手”时，遇见来自未来的他们俩。罗宾和马修则为谁才会获得“麦克拉伦酒吧新饮品发明者”的殊荣。

泰德和马修把巴尼的告别单身派对变成他一生中最糟糕的夜晚，或者这正是他们想要让巴尼感悟的？

罗宾在中央公园寻找自己多年前埋下的吊坠。泰德在帮助马修和莉莉打包去意大利的行李。巴尼和他未来的岳父在玩真人CS。

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.