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What looms on the horizons for Hawkins, Indiana? 

What is Vecna's villainous future plan? 

And seriously, whats happening between Will and Mike?

Here are some of the biggest mysteries the Duffer Brothers left for us to mull over until Stranger Things Season 5. 

WARNING: spoilers ahead!

1. Did Papa really love Eleven? 

Eleven has a twisted past with the manipulative mad scientist Martin Brenner, aka Papa. 

Brenner first orders Elven to make telekinetic contact with the entity her refers to as the master way back in Season 1. 

This connection unleashes a demogorgon and cracks open The Mothergate the first known passage between Hawkins and the Upside Down. 

With what we now know about Vecna, this places even more blame on Brenner for the otherworldly consequences that devastated Hawkins. 

In Stranger Things 4, Brenner plays a central role in reactivating Eleven telekinetic abilities, but he also shackles her with a restrictive, power-inhibiting collar. 

Then, before he dies, he unlocks the imprisoning device. 

This final gesture probably isn't as redemptive as Brenner wishes it was after he so recently and selfishly tried to contain Eleven, his motivations are mostly rooted in self-interest, as far as we know. 

Assumedly, he knows Elven has to be the one to defeat Vecna and save the world, so he releases her. 

Did he truly love Eleven like a daughter or is Vecna right about Brenner's primary goal of harnessing their greatness? 

Maybe Brenner does care for Eleven, but certainly not in the selfless way Hopper does. 

Though we may have seen the last of Brenner, his mysterious nature could still haunt the final season. 

2. Eleven created the Upside Down? 

As we learn more and more about the mythology of Stranger Things and the Upside Down, viewers have remained dedicated to figuring out all the specific ins and outs. 

In a pivotal flashback, we learn that Eleven sent One to the Upside Down, which is how he became Vecna. 

One detail in particular is a little unclear at first did Eleven create the entire Upside Down or just open the Mothergate?

3. Where is Vecna now? 

The last time we see Vecna, in true horror movie fashion, the seemingly dead Big Bad has suspiciously vanished. 

We know for a fast that he's badly injured after sustaining a rain of cocktail fire via Robin and several shotgun blasts from Nancy, but where is he hiding? 

We also learn more about his ability to indirectly inhabit other people through spore-like smoke of the Mind Flayer, so it may be a while before we see the physical form of him again. 

Vecna will surely take his time plotting his next move while he heals up now that Hawkins is broken. 

Can Eleven use her powers to track his physical form, or will he keep the Stranger Things gang busy with his vicious underworld creatures while his spores spread?

We'll find out in Stranger Things Season 5, slated for release in 2024 because good things come to those who wait.