Nancy, Mikey, Dustin, Will, Eleven and Luca are in the upside down. Why? Well, they heard that there's an entity more powerful than the mind flayer. Which intrigued them.

Nancy carried her gun, Eleven was ready to use her powers and the others had various weapons invaded this entity wasn't friendly.

They eventually came across a Demogorgon, they killed it and kept moving, the vines all over the place trying to get to them but then they kept destroying the vines. Trying to find this entity