Once Upon a Time Sneak Peek: Get Your First Look at Dark Hook -- But Why Is He Smiling?

Once Upon a Time unleashes its latest Dark One, and he's ... happy?

On Sunday's all-new episode (8/7c, ABC), we finally get a look at what Killian Jones (Colin O'Donoghue) is like as Dark Hook now that his inner darkness has been revealed and embraced. In the exclusive sneak peek above, it's clear

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