Hopper and Joyce enter the Upside Down to find Will. They locate him in the library with a tendril down his throat; Hopper successfully revives him with CPR.

Winona Ryder (Joyce), David Harbour (Hopper), Millie Bobby Brown (Eleven), Finn Wolfhard (Mike), and Noah Schnapp (Will). Plot Summary

Eleven protects Mike and the boys by pinning the Demogorgon to a wall and disintegrating it, causing both her and the monster to vanish.

While hiding at Hawkins Middle School, Eleven uses her powers to kill several government agents, but the blood attracts the Demogorgon.

Nancy, Jonathan, and an unexpected Steve lure the monster to the Byers' house, where they manage to injure and burn it using a bear trap and gasoline. The Epilogue (One Month Later) The Upside Down (episode) - Stranger Things Wiki

This guide covers the Season 1 finale, " Chapter Eight: The Upside Down ". The technical file name you provided refers to a high-definition "WebMux" release containing both Italian and English audio tracks in AC3 format [User Query]. Episode Overview Title: Chapter Eight: The Upside Down Release Date: July 15, 2016 Director: The Duffer Brothers