What appeared to be an egg was present in the Upside Down. When Eleven was immersed in a deep psychic state, she saw the Monster appearing to feed off the egg. Several days later, while Joyce Byers and Chief Hopper searched the Upside Down to find Will, they found an egg which appeared to be hatched. It is unknown whether these two eggs were one and the same, and if other eggs existed elsewhere in the Upside Down.

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