Emma and Regina are about to find out that the portal has open for a last time only to bring out a frozen evil in Storybrook.
The fourth season of the ABC fantasy-drama Once Upon a Time was announced on May 8, 2014. On May 13, 2014, it was revealed that the season would be split into two parts, the first half airing during 2014, and the second half during 2015 of the 2014–15 television season. It is set to premiere September 28, 2014.On April 20, 2014, it was confirmed that former Once Upon a Time in Wonderland star Michael Socha would be a series regular as his character Will Scarlet/Knave of Hearts. The final minutes of the third season finale revealed that Elsa will appear in some capacity. Kristoff and Anna from the 2013 film Frozen will also be introduced in Season 4, along with a new main antagonist, portrayed by Elizabeth Mitchell. The second half of the season will see the return of Kristin Bauer van Straten as Maleficent in a recurring capacity for a "major arc".
