"Once Upon A Time" Season 4 spoilers from OUAT show boss Adam Horowitz reveal the titles of the first three episodes of the ABC series. The network has also released photos of Queen Elsa, Kristoff, and a reindeer, which may or may not respond when called Sven. Meanwhile, watch a short video of the "Frozen" characters in an OUAT 4 SDCC sneak peek.

Spoiler alert: This feature contains Once Upon A Time Season 4 spoilers. Read only if you want to know what happens next in OUAT, with Frozen characters in Storybrooke.

Adam Horowitz on Twitter has announced the title of Once Upon A Time Season 4 premiere: "A Tale of Two Sisters." (More details here.) The OUAT showrunner has also revealed two other titles - "White Out" and "Rocky Road" - for the second and third episodes, respectively.

From the titles, Oncers are speculating that the Once Upon A Time Season 4 premiere is jumping straight into the Frozen story of Queen Elsa (Georgina Haig) and Princess Anna (Elizabeth Lail). The first title is about the sisters, the second is related to a snow storm, and the third could be really about a rocky, icy road (as opposed to some frozen dessert).

The first half of Once Upon A Time Season 4 is expected to be dedicated to the show's take on the popular Arendelle story.

"Executive producers Adam Horowitz and Eddie Kitsis told us that they deliberately did not put a twist on the Frozen characters [as seen in the 2013 Disney movie]," EOnline's Kristin Dos Santos reported, adding that OUAT 4 "will pick up with Anna planning her wedding to Kristoff."

Scott Michael Foster plays Anna's fiancé Kristoff. Incidentally, the show's ABC Web page is teasing a reindeer presence in its recently released photos (click on the link to view the photos). The pics are sparking a "Sven" curiosity among fans of the movie version.

One thing that is very clear from the latest Once Upon A Time Season 4 spoilers is that Princess Anna is marrying Kristoff. Watch Queen Elsa talk to Anna about this wedding in the sneak preview video below.

WATCH: Queen Elsa (Georgina Haig) and Princess Anna (Elizabeth Lail) in Once Upon A Time Season 4 Sneak Peek Clip at the San Diego Comic Con 2014

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Once Upon A Time Season 4 premieres on Sept. 28, Sunday on ABC. Horowitz has also announced on Twitter that John Rhys-Davies ("Lord Of The Rings") and Tyler Jacob Moore ("Shameless") are joining the OUAT cast for the Frozen arc. "Lost" alum Elizabeth Mitchell is also in, but her role remains under wraps.

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