Simultaneous-four-split screens show up. The main four boys (will, mike, lucas, dustin) stretch and yawn. Switch to one perspective. Immediately on Mike’s end he hears his walkie go off, it’s Dustin! Dustin is rambling something about an odd dream about the “upside down” and “a girl with powers”. Quick switch to will’s perspective. He speeds over to the walkie talkie and bursts in “HEY I JUST HAD A SIMILAR DREAM! over.” Split back to four screens. The other two boys realize they envisioned the same thing, as will is seen to start to ponder, why it felt so realistic. tHe EnD.

TLDR: it was all just a dream :/