Dee's pregnant, and she tells the guys that one of them made her that way during a Halloween party that none of them can remember. So they try to piece the evening together, "Potemkin"-style, aided by Artemis and the McPoyle brothers.

Dee takes a job as a substitute teacher and decides to take her students on a field trip to Broadway. The principal won't allow that, so it's a screening of the gang's movie---"Lethal Weapon 5"---instead.