Once Upon a Time creators Adam Horowitz and Edward Kitsis have recruited two actresses from the ABC fairy tale drama for their new series, Dead of Summer at FreeformElizabeth Mitchell and Elizabeth Lail, who recurred as Ingrid and Anna in the Frozen arc of Once, respectively, will star on Dead of Summer, which has a straight-to-series order. Mitchell’s relationship with Horowitz and Kitsis goes futher back to their work together on Lost.

Set in the late 1980s, the show — part coming-of-age story, part supernatural horror story– is set at Camp Clearwater, a seemingly idyllic Midwestern summer camp. Clearwater’s dark, ancient mythology awakens, and what was supposed to be a summer of fun soon turns into one of unforgettable scares and evil at every turn.

Lail will play the lead role of Amy, a clever but nervous camp counselor who is new to Camp Clearwater. Amy is not unfamiliar with being the new girl in social situations and the pitfalls that come with it, so she tries hard to fit in with the already bonded counselors. As the others reminisce about their past summers at camp, Amy is the first to discover clues that something disturbing is going on at Camp Clearwater.

Mitchell will play Deb, the new owner of Camp Clearwater. Once a camper herself, Deb has her heart set on bringing back the magic of the summer camp she loved. She exudes authority while simultaneously presenting a warm and welcoming vibe. Behind closed doors however, Deb seems to value her control over the camp for a much darker reason.

Mitchell and Lail join previously cast Zelda Williams, Mark Indelicato, Alberto Frezza, Eli Goree, Ronen Rubenstein and Paulina Singer.

Dead of Summer, from ABC Signature Studios, is written/executive produced by Horowitz, Kitsis and Once writer-producer Ian Goldberg. Horowitz and Kitsis will direct the first episode.

Mitchell, repped by Paradigm and Link Entertainment, will next be seen in The Purge 3. Lail is repped by ICM Partners and Authentic.