Rebecca Mader, who played Charlotte Lewis on "Lost," is set to appear on the ABC Sunday night drama.
"I couldn't be more excited and thrilled to be joining the cast of #Ouat," Rebecca Tweeted on Thursday. "Christmas came early this year."
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Executive Producer Adam Horowitz welcomed the actress (his old "Lost" colleague) via Twitter.
"Thrilled to welcome @bexmader to the #OnceUponATime family as... Well you'll just have to ...
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