Netflix has released a first look at season four of Stranger Things with an eerie teaser video.

Season three of the much-loved sci-fi drama aired back in summer 2019, so fans have been waiting nearly two years for a glimpse at what's next for Eleven (Millie Bobby Brown) and her gang.

After several pandemic-related delays, production is now underway on season four.

The short clip released by Netflix on Thursday is set in the Hawkins laboratory, the secret government lab where Eleven grew up. We see a group of children play in an experiment room.

"Good morning children", a mysterious man asks as he walks in.

"Good morning Papa", they respond.

"Today I have something very special planned for you", he continues. "Eleven, are you listening?"

Unfortunately, the teaser does not give any indication when the new season will come to the streaming giant.

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