Dark Waters

"Dark Waters" is the sixth episode of the sixth season of ABC's Once Upon a Time and the one-hundredth and seventeenth episode of the series overall. It was written by Andrew Chambliss and Brigitte Hales.

Starring

 * Ginnifer Goodwin as Mary Margaret Blanchard
 * Jennifer Morrison as Emma Swan
 * Lana Parrilla as Regina Mills
 * Josh Dallas as David Nolan
 * Emilie de Ravin as Belle French
 * Colin O'Donoghue as Hook
 * Jared S. Gilmore as Henry Mills
 * Rebecca Mader as Zelena
 * Robert Carlyle as Mr. Gold