Ted is set up with one of Barney’s discards as a Valentine’s Day date by Lily and Marshall. A co-worker invites Robin to a party.

Marshall and Lily were outed as toothbrush sharers as they were depressed over their own lousy weeks. A student’s name was mistaken for a gag by Ted and a guy is not calling Robin for …

Marshall is unable to convince Lily that a co-worker named Jenkins kissed him.

People watching Robin’s talk show play a drinking game and she finds out she is the subject of the game.

Ted is excited to get to know Cindy who is one of his students who is close to his age.The problem with Ted though, he is a teacher.

After being cold turkey for the longest time, Marshall starts smoking again, with Lily, Ted and Barney not far behind and reminded Marshall its bad for his lungs, making it the last cigarette ever.

Ted wanted to date the girl next door, Maggie, for years.

Her sudden break up with her latest boyfriend gives Ted and many other guys a chance to score with her.

Lily’s estranged father celebrates Thanksgiving with the gang.

Meanwhile, Ted and Robin are given the chance to use Marshall’s fourth Slap Bet on Barney, leaving the latter very unhappy.

Barney tries to get back into the dating scene after his breakup with Robin through the help of his “playbook.”

It wasn’t easy having a date, so he had to consult his book.

A major crisis in Barney and Robin’s relationship makes Ted and Marshall turn to Lily after their own plan fails.

Lily then tries to break up the relationship with Alan Thicke’s help.

Barney gives a relationship advice to Marshall. He convinces Marshall to grant Lily’s desire for Marshall to wash all dirty dishes immediately.

This advice turns out to be a big mistake, getting Marshall and Lily …

As she faces deportation, Robin decides to become a US citizen, but she cannot seem to let go of her Canadian heritage.

Meanwhile, Ted and Marshall take a road trip to Chicago to reminisce their bachelor …