Once Upon a Time finished its season four last Sunday with the two-part episode 4×21 ‘Operation Mongoose’; check out the full set of promotional pictures below!

SPOILERS

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Plot summary – The Author proves to be a formidable wild and forges an alliance with Gold. Emma, her parents, Hook and Regina scramble to stop them, but when Gold and the Author turn the tables on heroes and villains alike, the prospect of any happy outcome appears worlds away. Henry discovers he has big shoes to fill as he steps up to save his family before the story’s final page is turned. It’s a race to the finish, and everything culminates with a shocking twist that will leave the residents of Storybrooke reeling. Original airdate 10/02/2015.

Click them to enlarge (new window).
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Photos Courtesy of ABC.