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Maggie (Joanna Garcia), a girl next door Ted always wanted to date breaks up with her boyfriend, leaving a window of opportunity.
Barney get upset when Marshall gives one of his last two slaps to Robin and Ted; Lily's long-lost father (Chris Elliott) returns for Thanksgiving
Barney dusts off his old "playbook" to get himself back into the dating game after breaking up with Robin.
Ted and Marshall try to get Lily to break up Barney and Robin when they think they're miserable together.
Marshall and Lily mediate Robin and Barney's first fight; Barney pictures what things would be like if he were married to Lily
Ted proposed a road trip with Marshall to Chicago to get their favorite pizza and Lily wants in; Barney tries to help get US citizenship for Robin
Marshall and Lily try to have a double date with Barney and Robin; Girls appear at Ted's apartment looking for a place to crash, making him the sexless innkeeper
Robin thinks that Barney is cheating on her, when he's actually taking "Robin 101" classes from Ted.
While on a date, Ted realizes he's already met his date, Jen, seven years ago on a blind date. Barney discovers a Lily look-a-like stripper.
The new season of How I Met Your Mother kicks off with an episode titled "Definitions." In it, Robin and Barney try to keep their romance secret.