Stranger Things: The First Shadow
Stranger Things: The First Shadow is a play written by Kate Trefry from an original story by the Duffer Brothers, Jack Thorne, and Trefry. The story serves as a prequel to the events of the television series Stranger Things, exploring the backstory of Henry Creel before he became the antagonist Vecna.
Source: Wikipedia — Stranger Things: The First Shadow (CC BY-SA 4.0)