P.J. has to deal with both her relationship with Jack and Bobby's doubts concerning marriage. The boys have a mustache-growing contest, and Meredith gives birth.
P.J. tries to keep her new relationship from the guys, Brendan works over plans for his new club, and Mike decides to keep his mustache long after the contest is over.
Mike has P.J. questioning her qualifications as her paper's new columnist. Andy gives Bobby boyfriend advice. Mike and Kenny find they sorely lack Brendan's animal magnetism.
The gang's annual board game decathlon at Crowley's causes conflict between P.J. and Bobby. Stephanie studies the habits of the guys for a research project.