The first trailer for Stranger Things season 3 teases a truly horrifying new monster

The world of Hawkins, Indiana is about to turn upside down — again.

Netflix on Wednesday debuted the first trailer for the third season of Stranger Things, which teases a summer theme, trouble for one particular character, and a downright horrifying new creature.

After an extended opening sequence in which the gang uses Eleven's powers to play a prank on Dustin, we see footage of the kids living it up over the summer after two seasons set during the fall. But they're getting older, as the trailer makes abundantly clear when Mike defensively declares, "we're not kids anymore." It seems something will threaten to tear the group apart during the season, with Will looking wistfully at a photo of a more innocent time — that time being season 2.

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The trailer also teases the introduction of a new mall in Hawkins, which promises to be a central location, as well as a new character in Mayor Kline, played by Cary Elwes. But what's the season's central conflict? Well, the trailer features a brief shot of Billy Hargrove in the shower with some sort of infection on his arm, and it concludes with Jonathan being confronted by a horrifying new creature, which looks like the Demogorgon mixed with something out of The Thing. Could that infection have actually transformed Billy into this monster? Or might Billy become possessed much like Will was last season?

We'll find out when the third season of Stranger Things premieres on July 4. Watch the trailer below. Brendan Morrow