Who wrote the stage play Stranger Things: The First Shadow?

Who wrote the stage play Stranger Things: The First Shadow? Kate Trefry wrote it.

The play is based on an original story developed by the Duffer Brothers, Jack Thorne, and Trefry. That distinction matters: the Duffers and Thorne are credited with the story, while Trefry is credited as the play’s writer.

The First Shadow is a prequel to the Netflix series, set in Hawkins in 1959. It explores Henry Creel’s early life, long before he became the villain later known as Vecna. Stephen Daldry and Justin Martin directed the production, so Daldry is not the writer.

A common mix-up comes from the many prominent names attached to the project. Ross and Matt Duffer created Stranger Things, Jack Thorne helped develop the original story, and Daldry directed the stage production. Trefry’s specific role was writing the play itself, making her the canonical answer to this question.