As "Once Upon a Time" goes on hiatus until season 4, fans are already naming their fantasy casting choices for Anna, Elsa, and Kristoff.

Spoilers from WetPaint confirms that in addition to Elsa from "Frozen" joining "Once Upon a Time" season 4, her sister Anna and the male lead Kristoff will also be joining the series, and casting is currently underway.

According to TVLine, spoilers confirm that Elsa will appear in "approximately nine episodes of "Once Upon a Time" season 4, although whether the same can be said for Anna and Kristoff remains to be seen.

But who will play these roles? "Once Upon a Time" fans certainly have some suggestions.

"Megan Hilty for Elsa!" wrote Ladyluck527 on TVLine.

"My vote is for Bonnie Sommerville as Elsa!" added Lucas.

"I would love to see Sarah Michelle Gellar in the part," commented Whisperintherain. "From her work on 'Buffy the Vampire Slayer' and 'Ringer,' there is absolutely no doubt in my mind that she would do justice to Elsa’s inner turmoil."

Potential casting choices for Anna, according to WetPaint, include Anna Kendrick, Jane Levy, Karen Gillan, and Molly C. Quinn.

But what about the animated snowman character, Olaf? When pressed with this question, co-creator Eddy Kitsis had this to say: "No comment."