With Marshall and Lily's parental leave about to expire, the two scramble to find a nanny to take care of baby Marvin, while Barney goes back to his womanizing ways to get over his recent breakup with Quinn, organizing a festival called "Bangtoberfest" to pick up women.
In Marshall and Lily's search for a nanny, an elderly British woman named Mrs. Buckminster quickly emerges as the leading candidate, until they realize that they cannot afford her salary demands.
Lily and Marshall immediately realize it was Barney, but when they meet her at his apartment, she refuses to be a nanny for people who are friends with such a person.
However, Barney arrives looking disheveled and cries about many of the nannies ganging up on him and beating him up earlier that day – all because he cannot stop himself from his womanizing ways after he split from Quinn, no matter how hard he tries.
They think Mrs. Buckminster stole the child while Lily was asleep until they learn that Mickey took care of Marvin's needs for the whole day and even brought him to the park for a stroll.
Club's Donna Bowman described Barney's response to breaking up with Quinn as "wacky and unrealistic", Lily and Marshall's trouble finding a nanny as "cliche and predictable", and their combination as "an unpromising brew of sitcom business as usual".