两人分手后，泰德蓄起胡子，罗宾去阿根廷散心，一起回来的还有她的新男友，这让泰德十分气愤。马修和莉莉准备为泰德合伙对付罗宾的新男友，结果他们自己反倒被阿根廷人的魅力俘获。泰德跟着巴尼重新开始把妹，并完全丧失理智，这让罗宾向他道出了实情：她交男朋友是为了减轻与泰德分手的痛楚。

Ted and Barney pretend to be visitors to New York City to pick up women. Robin is still dating Gael.

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.

Barney and Ted compete for a girl. Robin is dating someone new.

Amid sharing stories with her about how members of the gang met each other, Ted's hot new girlfriend has a reaction to the meeting that gets her a high ranking on Barney's crazy scale.

Marshall has to contemplate giving up his plan of using his law degree to help the planet when he's courted by a major firm; Lily reveals a secret to Robin that not even Marshall knows; Ted discovers a porn actor is using his name

泰德告诉孩子，他们的马修叔叔总喜欢讲他自己一生中犯下的3次大错：

幼年迫于朋辈压力，绑着纸壳做的翅膀从屋顶一跃而下；

婚礼开始前，出于压力给他自己剃了个反莫霍克发型；

婚后在房地产市场最不景气、家庭财政负债累累的时候，盲目购置一处位于纽约“多威瑟崔普拉”的公寓——马修和莉莉签完合同才意识到“多威瑟崔普拉”（DoWiSeTrePla）其实是污水处理厂下风处（Downwind of the Sewage Treatment Plant）的缩写……

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

Lily and Marshall have their first Thanksgiving as a married couple; Barney is tortured by the slap bet countdown clock, worrying about when the slap will be dished out.

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's upcoming date with his doctor leads the gang to give him their own examples of why dating someone you already see regularly is a bad idea.

泰德继续找寻他的真命天女。在他见到自己的除纹医师斯黛拉后，泰德下定决心要在10次纹身消除过程结束前把她约出来——不过似乎斯黛拉年轻的接待员艾比对他更有意思。

巴尼万千前任炮友中的一位，向他美好的性福生活伸出毒手，但他并不知道是谁。于是巴尼仿照美国大学篮球联赛的“三月疯狂”锦标赛对阵表做出自己的复仇炮友对阵表，试图和大伙一起找出被他伤害得最深的那个女人。

马修被老板训斥后当面大哭一场，于是每个人都出谋划策，帮他如何在类似情境下更好地应对老板。

罗宾给了她前前前男友第二次机会，结果最后也只是换来第二次心碎。

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

巴尼找到新的男衬陪取代泰德，但那人十分羞涩，只要和女人在一起就会尴尬。泰德则发现自己的新女友斯黛拉已经5年没有性生活了。

巴尼计划假装求婚来帮艾比“夺回”泰德，但一根筋的艾比却信以为真。莉莉决定卖掉自己的画，挣钱修理他们新公寓的地板。

泰德向斯黛拉提出分手，但在一次改变人生的经历后又把话收了回去，然而斯黛拉之前并没意识到泰德其实是在和她分手……巴尼则在去医院看泰德的途中遭遇严重车祸。