Katie, jealous of Taylor's friendship with neighbor Viv, reluctantly competes in the Westport Halloween "Zombie Run" after she finds out they'll both be running. Meanwhile, Greg and Anna-Kat get a little too much in character for the "zombie" part of the run's obstacle course.

Katie swallows her pride and does the unthinkable, emulating the "perfect" Westport moms by dressing like them and hanging out at the yoga studio, in an attempt to get Anna-Kat a coveted invitation to a popular girl's birthday party.