The Upside Down eggs were large, yellow eggs present in the Upside Down that the Monster fed off.



The Monster was feeding off an egg when Eleven made psychic contact with it[1] .

Season One

When Nancy Wheeler entered the Upside Down, the Monster was feeding off an egg[2].

When Joyce Byers and Jim Hopper entered the Upside Down to search for Will Byers, Hopper found and briefly studied an egg near Castle Byers that appeared hatched; it was hollowed out and cracked open at the top.[3] .

It is currently unknown what, if anything, hatches out of these eggs.

Behind the scenes

Fractured FX Egg Prosthetic

The egg prosthetic created by Fractured FX.

Aaron Sims Creative created the concept art for the egg.[4] The company Fractured FX, who made the prosthetics for Will's fake body and Barbara's corpse, created the prosthetic for the egg as it was seen in Chapter Eight.[5]

Though it is not visible in the show, Aaron Sims revealed in an interview that the Monster was feeding off one of the eggs when Nancy saw it.[4]


  1. "Chapter Six: The Monster"
  2. "Chapter Five: The Flea and the Acrobat"
  3. "Chapter Eight: The Upside Down"
  4. 4.0 4.1 "Exclusive ‘Stranger Things’ Art Reveals ‘Upside Down’ Secrets and Barb’s Alternate End" ScreenCrush. August 22, 2016.
  5. "The Egg we created for STRANGER THINGS!" Facebook: Fractured FX. August 19, 2016.
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