Season 4 of Once Upon a Time is wrapping up with a two-hour finale this Sunday, and IGN has an exclusive clip at what to expect. Henry (Jared Gilmore) is in the clutches of The Author (Patrick Fischler) whose plans to stop anyone from getting an unhappy ending are about to get very dangerous for Henry himself... but there may be help from an unexpected source.

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Check out the clip below!Once Upon a Time's season finale, "Operation Mongoose" airs Sunday, May 10th at 8:00pm ET/PT on ABC.