When Zander winds up trapped in an alternate reality where his doppelgänger left a little more than just memories behind, Sally is on a ghostly mission to break him out. But why is she suddenly incorporeal? And how exactly do you babysit your boisterous alternate family?

Back home, a reality TV ghost-hunting squad has caught wind of some spectral activities, and Blayde must employ more than just wit and spunk to hide the interdimensional portal they inadvertently opened. Between ghostly pranks and portal cover-ups, it's all in a day's work.

In the Sallyverse, it's a heart-pounding race against realities. Time is ticking down, and as they delve deeper into the layers of the multiverse, they're faced with the chilling realization that reminder that alternate choices can lead to very real consequences