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Sierra McCormick (born October 28, 1997) is an American actress. She first became known for participating in the game show Are You Smarter Than a 5th Grader? (2007–2008) before making her acting debut with a recurring role as Lilith on the television series Supernatural (2008). She also starred as Scout Thomas on the comedy television series Romantically Challenged (2010), played Alice in the direct-to-DVD film Spooky Buddies (2011) for which she won a Young Artist Award, and Susan Kushner in the comedy film Ramona and Beezus (2010). She had her breakthrough starring as Olive Doyle on the Disney Channel series A.N.T. Farm (2011–2014). McCormick transitioned to more mature roles by starring as Moira in the horror indie film Some Kind of Hate (2015). She then earned critical acclaim for playing Fay Crocker in the science fiction film The Vast of Night (2019) and a nomination from the Critics' Choice Super Awards. She has since played Melissa in the horror film We Need to Do Something (2021), Scarlett Winslow in three episodes of the Hulu series American Horror Stories (2021), and Sybil in the thriller film The Last Stop in Yuma County (2023). Her latest role is Mary Sue in the straight-to-video action comedy Killing Mary Sue (2025). Description above from the Wikipedia article Sierra McCormick, licensed under CC-BY-SA, full list of contributors on Wikipedia.

After All
as Monica

Killing Mary Sue
as Mary Sue

Acting Out
as Sierra

The Last Stop in Yuma County
as Sybil

Camp
as Lily

The Nana Project
as Sarah

Edge of Everything
as Abby

Exploited
as Chloe

We Need to Do Something
as Melissa

American Horror Stories
as Scarlett Winslow

VFW
as Lizard

Who Stole My Daughter?
as Katie Sullivan

All Good Things
as Bailey

The Vast of Night
as Fay Crocker

Pretty Little Stalker
as Bridget

Seduced by My Neighbor
as Allie

The Neighborhood Nightmare
as Allie

The Honor List
as Charlotte

Christmas in the Heartland
as Kara Gentry

Sorority Nightmare
as Sarah

Some Kind of Hate
as Moira

Jessie
as Connie Thompson

Spooky Buddies
as Alice

Disney's Friends for Change Games
as Self

A.N.T. Farm
as Olive Doyle

A Nanny for Christmas
as Jackie Ryland

Ramona and Beezus
as Susan

Romantically Challenged
as Scout Thomas

The Dog Who Saved Christmas
as Kara Bannister

Land of the Lost
as Tar Pits Kid
Are You Smarter Than a 5th Grader?

Hannah Montana
as Gillian

Supernatural
as Lilith

Medium
as Adolescent Allison

Boston Legal
as Daniella

NCIS
as Sally Clark

Monk
as Anne Marie

Curb Your Enthusiasm
as Emma

CSI: Crime Scene Investigation
as Gracie Layman
Burnouts

I Don't Want to Drink Your Blood Anymore
Building Blocks
as Adult Desariee

Last Chance Motel

Sigil