Ted wants to go on a date without any internet background research. Marshall and Lily want to go into a delivery without any gender knowledge. Both get disrupted by Barney.

Marshall pushed his boss (Martin Short) to fight harder for their cause. Robin and Kevin (Kal Penn) move from therapy to dating. Ted has a disastrous field trip experience with his class. Barney mistakes Nora for being too old for his tastes. All bad story lines, but none as bad as Lily's...

Robin tells a therapist how the blossoming Barney/Nora relationship drove her to assault a stranger as Ted inserts himself into Marshall and Lily's pregnancy.