In an attempt to solve an international case, Jake and Rosa are forced to work with a pair of Swedish cops and things get very competitive, very quickly. Meanwhile, Amy and Terry offer to help Gina prepare for a big test and Holt enlists Charles to sub in as his squash partner for an annual tournament.

When Joe is trampled in a local running of the bulls and becomes a quadriplegic, the guys find it too difficult to hang around him. Meanwhile, Brian sleeps with a married woman, and when the husband returns home, he pretends to be the family’s new dog.

A new threat emerges.

K.C. plans to give her dad the most perfect christmas gift of all, a surprise visit from his dad. When he arrives, she’s the one who ends up surprised. It turns out that Craig and Poppa Earl not only don’t get along very well, he also has no idea that they are all spies.

The dark siege of Storybrooke is underway as all of the resurrected Dark Ones target a living soul for sacrifice so that they can return to the realm of the living. With doom imminent, Gold advises Mary Margaret, David and the rest of the heroes to spend their last fleeting moments enjoying the company of their loved ones. Emma, however, refuses to give up, knowing that she is responsible for righting all the poor choices she made as Dark One - there's only one problem, Dark Hook. When they face-off with the fate of Storybrooke at stake, Hook's actions will devastate Emma in a way no one saw coming. In a Fairy Tale Land flashback, the Evil Queen tests Hook's mettle by forcing him to confront a demon from his past before contracting him to dispatch one from hers.

Noah grapples with essential questions. Alison begins to doubt a recent ambition, and renewed interactions with the Lockhart brothers force her to consider a harrowing possibility.

Kevin comes clean to a skeptical John about his connection to Evie's disappearance, as Miracle faces an unexpected threat on the fourth anniversary of The Departure.

When people begin suffering the effects of accidents and sins in which they have not actually been involved, the team tracks the connection to the perpetually young Dorian Gray, whose magic now works on selfies.

Lisa sets out to restore the tarnished reputation of Springfield’s first female inventor. To find her invention, she scours an abandoned asylum and a restaurant that caters to men. Bart joins Lisa at the asylum, stealing one of the homicidal patient’s notebooks, and bragging to the boys at school that he wrote the entries himself. This revelation causes Homer and Marge to believe he is a sociopath, which Bart decides to use to his advantage until things go too far.