Andrew (Ben Feldman) and Zelda (Cristin Milioti) break with their respective traditions and decide to throw a joint Halloween party, much to the dismay of Stu (Henry Zebrowski) and Stephie (Lenora Crichlow), who feel like they are losing their best friends. Meanwhile, with Big Bird (Christina Kirk) looking for a solid promotional opportunity to boost the profile of the company, Henry takes it upon himself to enlist the help of Ray Parker Jr. (guest starring as himself) to attend their annual Wallflower Halloween party.