ONCE UPON A TIME - "Operation Mongoose, Part 1 and Part 2" - The Author proves to be a formidable wild card 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, in the captivating two-part season finale of "Once Upon a Time," SUNDAY, MAY 10 (8:00-10:01 p.m., ET) on the Walt Disney Television via Getty Images Television Network. (Photo by Jack Rowand/Walt Disney Television via Getty Images)
