When the Kappa Taus have trouble making the volcano for their legendary Mt. Vesuvius party work properly Rusty volunteers to make it happen. With the help of Dale and Jen K, a ZBZ pledge, Rusty is able to steal an outmoded atmospheric destabilizing module to plant inside the volcano for the eruption effect. Meanwhile, Casey and Evan are back on track and Evan introduces Casey to his parents over dinner. However, Rebecca makes an unexpected appearance and instantly bonds with Evan's parents leaving Casey to feel like an outsider of this blue-blood clan.