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Slug-like creatures from the Upside Down inhabited the bodies of the Monster's victims.


Season One

Immersed in an enhanced psychic state, Eleven scoured the Upside Down to find Will Byers and Barbara Holland. She discovered Barb's corpse and saw a slug-like creature slither out of Barb's mouth and across her face.[1]

Will was later found in the Upside Down with a tendril extending down his throat following his capture by the Monster. A month after returning home, Will coughed up one of the slug-like creatures and washed it down his bathroom sink drain.[2]


The slugs were dark brown-green in color, with bright yellow spots.

Behind the scenes

The slugs were added with computer graphics in post-production by visual effects studio CoSA VFX.[3][4]

In the original script for "Chapter Seven," a spider crawled out of Barb's corpse instead of the slug in the final version.[5]



  1. Stranger Things Season 1: "Chapter Seven: The Bathtub"
  2. Stranger Things Season 1: "Chapter Eight: The Upside Down
  3. "CoSA VFX Stranger Things Season 1 - VFX Reel" by CoSA Visual Effects on Facebook. July 20, 2016. (Video removed)
  4. "CoSA VFX Stranger Things Season 1 VFX Reel" by Vfx Guru on YouTube. July 24, 2016.
  5. "Exclusive ‘Stranger Things’ Art Reveals ‘Upside Down’ Secrets and Barb’s Alternate End" ScreenCrush. August 22, 2016.

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