The Spider Monster, a terrifying creature from Stranger Things Season 3, regains its psychic link to the Upside Down's hive mind when a new gate is opened in Hawkins. This fragment of the Mind Flayer, which had been lying dormant at Brimborn Steel Works, immediately sets out to create a more corporeal form through which it could operate. It does this by creating a creature entirely composed of stolen bone, cartilage, and flesh. This is how the Spider Monster, also known as the Stranger Things Season 3 monster, reestablishes its connection to the hive mind of the Upside Down.