NBC released a promo video of Stranger Things alum Finn Wolfhard preparing to host this weekend's edition of Saturday Night Live.

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Wolfhard is seen walking the halls of the New York studio where the sketch-comedy show is taped when the lights start to flicker and smoke comes out of a door.

"It's Vecna! He's back!" Wolfhard declares, grabbing a broom and breaking it over his knee.

"Get behind me. I'll handle this," he tells Kam Patterson, who is holding a spray bottle of window cleaner as a weapon.

Entering the mysterious room, the sights and sounds are revealed to be connected to a sick-looking Sarah Sherman sitting next to a scent diffuser, who grimaces, "I had greasy beef cubes again -- extra spicy."

"Ugh, gross," a horrified Wolfhard says as Sherman chugs anti-acid medicine.

"This is one of her good days, bro," Patterson quips.

"I almost shot you," he tells Sherman, clicking his spray bottle. "I thought you were Vecnar."

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"Vecna!" Wolfhard corrects him from on-screen.

The final episode of Stranger Things aired on Netflix New Year's Eve, while a "making-of" documentary dropped this week.