Dark clouds (and a giant tentacled monster) are lurking over the skies of Hawkins, Indiana, in the eerie first full trailer for Stranger Things' return.

As expected, Netflix delivered the perfect balance of creepy and undeniable fun in a 'Thriller'-set preview of the Emmy-nominated sci-fi series' second season at Comic-Con International on Saturday (July 22).

preview for Stranger Things season 2 Comic-Con trailer

Stranger Things still seems to be infused with its trademark aurora of mystery as it picks up in the aftermath of Will Byers's (Charlie Heaton) miraculous return from The Upside Down.

And while all seems well while on the surface, there's still something very wrong with Will which we see first hand in the trailer when the poor guy gets sucked momentarily back into (what appears to be) The Upside Down as we're warned that "something's coming".

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Bear Grylls//Digital Spy

"I saw something," a tearful Will tells his mum Joyce (Winona Ryder). "I felt it everywhere!"

Will the return of Eleven (Millie Bobby Brown) who we see literally burst through the Upside Down provide the answers that Mike (Finn Wolfhard) and his pals desperately seek to save Will once again?

As for that hulking tentacled beast on the loose in Hawkins, producer Shawn Levy recently promised that it's going to make the terror of season one look tame in comparison.

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Bear Grylls//Digital Spy

"I think overall the kind of forces of evil that are inherent in season two make that Demogorgon look quaint in retrospect," he teased.

The first season of Stranger Things cleaned up with 18 Primetime Emmy Award nominations earlier this month, so the pressure is truly on as producers put the finishing touches on the second run.

Stranger Things returns on October 27 on Netflix worldwide.

From: Digital Spy