A film version was created with the original Broadway cast in February.

Stranger Things: The First Shadow will end its run on Broadway and in the West End this winter.
The West End production will shutter at the Phoenix Theatre first, on December 27. The Broadway mounting is scheduled to close at the Marquis on January 3.
A filmed version of the stage production was recorded at the Marquis in February. No release timeline or details have been made available by producers Netflix and Sonia Friedman Productions.
Based on an original story by the Duffer Brothers, Jack Thorne, and Kate Trefry, and rooted in the mythology of the popular Netflix series, Stranger Things: The First Shadow is a new play written by Kate Trefry, directed by Stephen Daldry, and co-directed by Justin Martin. It takes place before the series, in 1959, and explores how Henry Creel was taken under mysterious forces and transformed into the villan known as Vecna.
The production features set design by Miriam Buether, costume design by Brigitte Reiffenstuel, lighting design by Jon Clark, sound design by Paul Arditti, original music composition, orchestration, arrangements, and supervision by D.J. Walde, illusions design and visual effects by Jamie Harrison and Chris Fisher, video design and visual effects by 59, choreography by Coral Messam, movement direction by Lynne Page, and wig, hair, and makeup design by Campbell Young Associates..