When Barney is about to complete the perfect week – landing seven different girls in seven days – the gang roots him on in order to forget about their own miserable week.
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When Marshall’s co-worker kisses him, he can’t get Lily to believe it happened. Robin discovers she’s the subject of a drinking game.
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Barney chooses between wearing suits and sleeping with a sexy bartender. Meanwhile, Ted gets ever closer to meeting “the mother”.
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When Marshall picks up smoking again, it prompts Lily, Ted and Barney, ex-smokers all, to succumb as well. Meanwhile, Robin gets a new co-anchor at her show…
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When a perfect girl finally shows up, the gang tries everything to help Ted, while Marshall takes action when he discovers a letter written by younger himself.
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Barney’s unhappy after a slap bet is bequeathed to Ted and Robin by Marshall. Lily’s long-absent father arrives for Thanksgiving.
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After Barney (Neil Patrick Harris) and Robin hit a rough patch in their relationship, Lily devises the perfect plan to break them up, calling in help from Robin’s famous friend, Alan Thicke.
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Despite their best efforts to be the perfect couple, Barney’s know-it-all attitude gets him in trouble with Robin and they are forced to ask Marshall and Lily for relationship advice

Barney wants Robin to become an American citizen; Lily joins Marshall and Ted on their road trip.

When Lily and Marshall realize that Robin and Barney are the perfect double-date friends, they try too hard to impress and come on too strong, forcing Barney and Robin to try to break up with them