A routine military exercise turns into a nightmare in the Scotland wilderness.

"Jellicle" cats join for a Jellicle ball where they rejoice with their leader, Old Deuteronomy. One cat will be chosen to go to the "Heavyside Layer" and be reborn. The cats introduce themselves.

A teenager finds her perfect life upended when she's stalked by a mysterious doppelganger who has her eyes set on assuming her identity.