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Meanwhile, in the Enchanted Forest, Emma struggles to resist her dark urges as she searches for Merlin in the hope that he can stop her transformation. Immediately after becoming the Dark One, Emma disappears and the heroes must band together to save her, but first they have to find her, which will require the help of an unlikely ally. Eric Keenleyside is now billed as "guest starring".Olivia Steele Falconer is billed as "guest starring" starting with " Dreamcatcher", previously billed as "co-starring".Sean Maguire is now billed as "starring".Rebecca Mader is now billed as "starring".Michael Socha is no longer billed as "starring".Arnold Pinnock as the Orderly ("Only You").Rya Kihlstedt as Cleo Fox (" Firebird").Isabella Blake-Thomas as Young Zelena ("Sisters").Paul Scheer as the Scarecrow (Voice) ("Our Decay").Teri Reeves as Dorothy Gale (" Our Decay").Costas Mandylor as Captain Silver (" The Brothers Jones").Aaron Douglas as Fendrake the Healer (" Devil's Due").Jonathan Whitesell as Hercules ("Labor of Love").Kacey Rohl as Megara (" Labor of Love").Greg Germann as Hades (" Souls of the Departed").Adam Croasdell as Brennan Jones ("Swan Song").Oliver Bell as Young Killian (" Swan Song").Caroline Morahan as Queen Elinor ("The Bear King").Lily Knight as the Witch ("The Bear King").Glenn Keogh as King Fergus (" The Bear King").Paul Telfer as Lord Macintosh (" The Bear and the Bow").Ryan Robbins as Sir Morgan (" Dreamcatcher").Ehren Kassam as Young Kay ("The Broken Kingdom").Dalila Bela as Young Guinevere (" The Broken Kingdom").Giacomo Baessato as Grif (" Siege Perilous").Olivia Steele Falconer as Violet Morgan (co-starring episodes 2–4, recurring episodes 5-23) ("The Price").Joana Metrass as Guinevere (" The Price").Elliot Knight as Merlin ("The Dark Swan").Andrew Jenkins as Percival ("The Dark Swan").Liam Garrigan as King Arthur (" The Dark Swan").Eric Keenleyside as Maurice/ Moe French.Robert Carlyle as Rumplestiltskin/ Mr.Josh Dallas as Prince Charming/ David Nolan/ Prince James.Lana Parrilla as Evil Queen/ Regina Mills/ Evil Queen (Serum).Ginnifer Goodwin as Snow White/ Mary Margaret Blanchard.Wes Brown as Gaston (" Her Handsome Hero").Evil Queen (Serum) (" An Untold Story").
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Lord Macintosh (" The Bear and the Bow").