Marshall and Lily set up Ted with one of Barney\’s discards as a Valentine\’s Day date. Meanwhile, Robin\’s invited to a party by a co-worker.

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.

Airdate: 18 January, 2010
Summary: 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.

Airdate: 11 January, 2010
Summary: Barney chooses between wearing suits and sleeping with a sexy bartender. Meanwhile, Ted gets ever closer to meeting \”the mother\”.

Airdate: 14 December, 2009
Summary: 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…

Airdate: 7 December, 2009
Summary: 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.

Airdate: 23 November, 2009
Summary: Barney\’s unhappy after a slap bet is bequeathed to Ted and Robin by Marshall. Lily\’s long-absent father arrives for Thanksgiving.

Airdate: 16 November, 2009
Summary: Barney dusts off his \”playbook\” to help him back into the dating scene following his breakup with Robin.

Airdate: 9 November, 2009
Summary: 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\’

Airdate: 2 November, 2009
Summary: 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 fo