The Upside Down has leaked over to another dimension. Eleven was the first to find out, and found a way to dab into this new dimension, only to find a shocking surprise on this dimension's logics. But worse is to come, when they realized that the parallel dimension of The Upside Down can find it's way into the very dimension that is the reason they are alive in the first place.

The area is a dark abyss... Nothing but darkness... ... But in this dark abyss... Shows up a boy. A boy with spiky hair. A boy with a giant Key in his hand. A young boy by the name of Mark sees him. Mark starts to walk towards the boy, only to be met with 3 stands. One with a sword, one with a staff, and one with a shield.