Melinda helps a patient of Eli's who thinks he's being watched by his sister's ghost. Meanwhile, Melinda and Jim are concerned when Aiden talks about his shiny friends that aren't ghosts but something else.
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.
Cappie and Evan's fraternities are at war with each other, while Casey must protect the ZBZ reputation when Lizzi organizes a mixer at the dorkiest fraternity on campus.
Rusty and Casey return to CRU but must contend with the backlash from Jen K's story, and deal with the fallout from their relationships. Meanwhile, Cappie and Rebecca must make a choice about their relationship.
While researching for a test on the actives Rusty uncovers a Kappa Tau mystery, Casey discovers information about Max's past girlfriend, and Michael, Calvin, Rebecca and Ashleigh all go to a gay bar.
