Stranger Things Season 2 Episode 8
Chapter Eight: The Mind Flayer
The pack of creatures take up residence in the lab, and make it clear they intend to kill everyone. Mike thinks it's best to sedate Will so he cannot find them, and she agrees.
Everyone is trapped in the security room and the power goes out. Bob says he will reset the breakers to help them escape. Owens guides the team from afar because he can check the security footage.
Just when it seems like everyone is escaping, Bob is mauled by a group of the creatures as Joyce screams for help. They meet up with Nancy and the others who came to the lab because of the noises.
They tie up Will in the shed so that Will does not know where he is, but Will leaves them a message via morse code, telling them to close the gate. The monster finds ot the location when the house phone rings.
They all barricade themselves in the house.