Lyndsey’s boyfriend sets Alan up on a date; Walden wants to help Nicole with her project so she will have time to date him.

Walden and Alan find themselves on dates with two ideal women until Lyndsey’s jealousy throws a wrench in their evening.

After Robin assaults a girl who is out to ruin Barney’s relationship, she is forced to begin court-mandated therapy sessions. Meanwhile, Ted gets too involved in Lily’s pregnancy.