ABC released an official synopsis this week for the premiere episode of Once Upon a Time's third season, titled The Heart of the Truest Believer.

The episode will feature Emma (Jennifer Morrison), Mary Margaret (Ginnifer Goodwin), David (Josh Dallas), Regina (Lana Parrilla), Mr. Gold (Robert Carlyle) and Hook (Colin O'Donoghue) traveling by ship to Neverland to rescue Henry (Jared S. Gilmore). Before they can find him the group encounters a group of unfriendly mermaids that try to put a stop to their mission. Meanwhile, Henry is being held prisoner at Peter Pan's camp but he tries to break free with one of the Lost Boys.

Neal (Michael Raymond-James) travels with Mulan (Jamie Chung) back in Enchanted Forest in an effort to find out the fate of Emma and Henry.

The series' producers are looking to cast the roles of Glasses and Keychain, according to a Thursday report by E! Online. They are two British Lost Boys serving under the command of Peter Pan in their late 20s with stoic personalities. Glasses is described as sophisticated and focused while Keychain is the wild one.

It is unknown when either Glasses or Keychain will appear in season 3.

SpoilerTV revealed recently that Mr. Gold/Rumplestiltskin's father, Colin, will show up on this season in a flashback. The report described him as "dissatisfied, self-centered and ruthless."

Season 3 of Once Upon a Time premieres Sunday, Sept. 29 at 8 p.m. on ABC.

Tags
Once Upon A Time, Once Upon A Time Season 3, Spoilers