Mike's dad arrives in town just in time for his bachelor party. However, it's Molly's bachelorette party where the naughtiness is really at.
In an effort to get in shape, Charlie and Mac join a fitness group that turns out to be a new way of life.
The gang tries to figure out who the father of Dee's baby is by throwing a house party for all her former flings.
Mac and the team are mystified when a woman claims to have murdered her unfaithful husband, only to be cleared by DNA evidence.
A routine trip to a convenience store places the gang in the middle of an armed robbery; each member faces their reactions.