Sierra Burgess Is a Loser: This Cast Is So Good, You'll Wish It Was September Already

Shannon Purser — the Stranger Things fan favourite Barb and Riverdale's Ethel Muggs — will be taking on the title role of Sierra Burgess, a smart and driven high schooler who forms a connection via text message with a popular athlete who thinks she's someone else.

The model and Junior actress Kristine Froseth is sought-after cheerleader Veronica in the film, and she agrees to help Sierra catfish Jamey in exchange for help with her schoolwork.

Chrissy Metz is taking a break from destroying us on a weekly basis in This Is Us to play Veronica's mother.

RJ Cyler from Me and Earl and The Dying Girl will play the role of Dan, Sierra's bandmate and best friend who finds his relationship with Sierra strained as she and Veronica grow increasingly closer.

Lea Thompson, who you'll definitely recognise from Back To The Future and, more recently, Switched At Birth, is taking on the role of Mrs. Burgess, Sierra's mom.

Playing opposite Lea Thompson as Mr. Burgess is veteran actor Alan Rick, who — if you don't recognise from NCIS or CSI — you might recognise as hopeless hypochondriac Cameron Frye from Ferris Bueller's Day Off.