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A tendril was found inside Will Byers' body while he was strung up in the Upside Down equivalent of Hawkins' public library.
Joyce and Chief Hopper found Will Byers with the tendril in his mouth, extending through his esophagus, and into his stomach. Hopper pulled it out of his throat before shooting and killing it. 
Behind the Scenes
The tendril was made of rubber and edited with visual effects in the final version.
- ↑ Stranger Things Season 1: "Chapter Eight: The Upside Down"
- ↑ "Cast of "Stranger Things" | BUILD Series" BUILD Series on YouTube. September 7, 2016.