EMMA DISCOVERS THAT THE STORYBROOKE RESIDENTS HAVE NO MEMORY ABOUT HOW THEY RETURNED TO THE TOWN, THEIR PAST YEAR BACK IN FAIRY TALE LAND, OR WHO WAS RESPONSIBLE FOR THE NEW CURSE, ON ABC'S "ONCE UPON A TIME"

Rebecca Mader Guest Stars as the Wicked Witch of the West

"Witch Hunt" - Emma arrives in Storybrooke with Henry and reunites with her friends and family, only to discover that no one remembers how they were transported back - or the past year they had spent back in Fairy Tale Land. But Emma is sure that someone in town is responsible for this new curse and teams up with Regina in an attempt to uncover their identity. Meanwhile, in the Fairy Tale Land that was during the past year, Regina, with the aid of Robin Hood, attempts to break into her castle, which has been overtaken by the Wicked Witch, on "Once Upon a Time," SUNDAY, MARCH 16 (8:00-9:00 p.m., ET) on the ABC Television Network.

"Once Upon a Time" stars Ginnifer Goodwin as Snow White/Mary Margaret, Jennifer Morrison as Emma Swan, Lana Parrilla as the Evil Queen/Regina, Josh Dallas as Prince Charming/David, Emilie de Ravin as Belle, Colin O'Donoghue as Hook, Michael Raymond-James as Baelfire/Neal Cassidy, Jared S. Gilmore as Henry Mills and Robert Carlyle as Rumplestiltskin/Mr. Gold.

Guest starring are Lee Arenberg as Leroy/Grumpy, David Anders as Dr. Whale, Raphael Sbarge as Archie Hopper/Jiminy Cricket, Beverley Elliott as Granny, Rebecca Mader as the Wicked Witch of the West, David-Paul Grove as Doc, Gabe Khouth as Mr. Clark/Sneezy, Faustino Di Bauda as Sleepy, Jeffrey Kaiser as Dopey, Michael Coleman as Happy, Mig Macario as Bashful, Sean Maguire as Robin Hood, Raphael Alejandro as Roland, Michael P. Northey as Friar Tuck, Jason Burkart as Little John and Nesta Chapman as nurse.

"Witch Hunt" was written by Jane Espenson and directed by Guy Ferland.

"Once Upon a Time" is broadcast in 720 Progressive (720P), ABC's selected HDTV format with a 5.1 channel surround sound. This program carries a TV-PG,V parental guideline.

For more information on "Once Upon a Time," visit ABC.com/Once