Season 4 Episode 21 Operation Mongoose Part 1

Once Upon a Time Season 4 Episode 21 & 22 "Operation Mongoose"Promo (Season Finale)

The villains finally get their happy endings and the forces of good are a thing of the past in the two-hour season finale of Once Upon a Time, Season 4 Episode 21 "Operation Mongoose Part 1" & Episode 22 "Operation Mongoose Part 2" airing next Sunday on ABC.