Lily and Marshall throw a housewarming party, where Ted nearly comes to blows with Marshall’s boss, and Barney hits on a crazy divorcee.

After celebrating New Year’s Eve, Marshall visits his father’s graveside to carry on their tradition of tailgating. Meanwhile, Barney and Ted open a bar called “Puzzles”, and Robin is forced to fill in for an inebriated news anchor.

When Robin receives bad news, she decides to lie about it to the gang. Meanwhile, Marshall hangs Christmas decorations on the house in the suburbs with help from his neighbours.

Ted and Barney discuss making a life-changing decision together, and Robin tries to discourage Marshall and Lily from moving to Long Island.

Barney and Robin find themselves in an uncomfortable situation when they hide a secret from their significant others. Meanwhile, Marshall, Lily and Ted attend a concert.

While the gang reminisces about Hurricane Irene, Barney tries to cut a deal with Marshall and Lily to get out of wearing the Ducky Tie.

Ted finally meets his mystery girl in the Slutty Pumpkin costume. Meanwhile, Barney learns he is part Canadian, and Lily has pregnancy brain.

The gang begins to realize their romantic partner reminds them of one of their parents. Meanwhile, Barney and Nora’s planned romantic evening is ruined by a string of bad events.

When Ted goes on a date without researching the girl on the Internet, the gang interferes, showing Kevin that they are too into each other’s business. Meanwhile, Lily and Marshall come to terms with finding out the sex of their baby.