ABC's long-running fantasy television series, Once Upon a Time, is set to start its fourth season on Sept. 28. After the jaw-dropping finale of the third season, where it was then hinted – and later confirmed – that Elsa from Disney's Frozen has come to Storybrooke, some fairytale fans are eager for bits of information on what's coming up in the next episodes.

Viewers will see Australian actress Georgina Haig take on the role of Elsa. As the teaser trailer shows, she will make an unforgettable entrance in the fairytale village. She will be joined by Elizabeth Lail who plays Anna, Scott Michael Foster who portrays Kristoff, and Tyler Jacob Moore who gets to be Hans.

Other than the Frozen characters, Belle's mother will also be seen this season. In an interview with Entertainment Weekly, executive producer Adam Horowitz said, "For the first time, we'll delve into Belle's past pre-the encounter with Rumple."

Frances O'Connor (Cashmere Mafia, Mr. Selfridge) will be playing Belle's mother, Colette. She is expected to appear in the sixth episode, with possible appearances in succeeding episodes.

Furthermore, Horowitz hinted in an interview with TVLine that there will be more about Hook's past, although the details still remain a mystery. There will also be a pompous prince in episode seven who, as the mag says, will turn out to be a coward.

John Rhys-Davis has been cast as Pabbie, Elizabeth Mitchell will probably be seen as an evil Snow Queen, while there is yet no word on who will play the new character Lily.  

Jennifer Morrison will reprise her role as Emma Swan, and Ginnifer Goldwin will return as Snow White/ Mary Margaret Blanchard. Other main characters that fans will see this fourth season include: Lana Parilla (Regina), Josh Dallas (Prince Charming), Emilie de Ravin (Belle), Colin O'Donoghue (Captain Hook), Jared S. Gilmore (Henry Mills), Robert Carlyle (Rumplestiltskin), and Michael Socha (Will Scarlet).

The list of titles for the first six weeks has also been revealed, namely: The Tale of Two Sisters; White Out; Rocky Road; The Apprentice; Breaking Glass; and Family Business.