Operation Mongoose Part 1

"Episode 421" is the twenty-first episode of Season Four of ABC's Once Upon a Time. It will be the eighty-seventh episode of the series overall, and will premiere on May 10, 2015.

Starring

 * Ginnifer Goodwin as Snow White/Mary Margaret Blanchard
 * Jennifer Morrison as Emma Swan
 * Lana Parrilla as Evil Queen/Regina Mills
 * Josh Dallas as Prince Charming/'''David Nolan
 * Jared S. Gilmore as Henry Mills

Guest Starring

 * Kristin Bauer van Straten as Maleficent/Maleficent
 * Sean Maguire as Robin Hood/Robin Hood
 * Timothy Webber as The Apprentice/The Apprentice