Official story details for the 21st episode of Once Upon A Time add further context to the earlier synopsis. Bite into “An Apple Red As Blood” below, which includes further clues by way of the returning guest stars.

HENRY PLEADS WITH EMMA TO STAY IN STORYBROOKE AND CONTINUE HER QUEST TO SAVE THE FAIRYTALE INHABITANTS, AND SNOW WHITE – WITH THE AID OF FELLOW FAIRYTALE COHORTS – PLANS AN ATTACK AGAINST THE EVIL QUEEN IN ORDER TO SAVE PRINCE CHARMING, ON ABC’S “ONCE UPON A TIME”

“An Apple Red as Blood” – Henry pleads with Emma to stay in Storybrooke and continue her quest as the savior of the fairytale dwellers, and Regina concocts a plan that could rid her of Emma forever. Meanwhile, back in the fairytale land that was, Snow White enlists the aid of her fellow fairytale cohorts to attack the Evil Queen and save Prince Charming’s life, on “Once Upon a Time,” SUNDAY, MAY 6 (8:00-9:01 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, Robert Carlyle as Rumplestiltskin/Mr. Gold, Lana Parrilla as Evil Queen/Regina, Josh Dallas as Prince Charming/David, Eion Bailey as August, Jared Gilmore as Henry Mills and Raphael Sbarge as Jiminy Cricket/Archie Hopper.

Guest starring are Lee Arenberg as Leroy/Grumpy, Keegan Connor Tracy as Mother Superior/Blue Fairy, Meghan Ory as Ruby/Red Riding Hood, Beverley Elliott as Granny, Alan Dale as Decker/King George, David-Paul Grove as Doc, Gabe Khouth as Mr. Clark/Sneezy, Faustino Di Bauda as Walter/Sleepy, Jeffrey Kaiser as Dopey, Michael Coleman as Happy, Mig Macario as Bashful and Sebastian Stan as Jefferson.

“An Apple Red as Blood” was written by Jane Espenson & David H. Goodman and directed by Milan Cheylov.

“Once Upon a Time” is broadcast in 720 Progressive (720P), ABC’s selected HDTV format with a 5.1 channel surround sound. A TV parental guideline will be assigned closer to the airdate.