[s4e7] Chapter Seven: The Massacre At Hawkins Lab -

While attempting to escape the Upside Down, Nancy is hijacked by Vecna.

For years, the "Hawkins Lab Massacre" was framed as a tragedy caused by Eleven’s lack of control. This episode flips the script, revealing that Eleven wasn’t the killer—she was the survivor. The true perpetrator was , the lab’s first subject who had been hiding in plain sight as a friendly orderly. Key Revelations [S4E7] Chapter Seven: The Massacre At Hawkins Lab

This chapter effectively ends the mystery of Eleven's origins. It establishes that: While attempting to escape the Upside Down, Nancy

As Henry is pushed into the "hellscape" dimension, he is struck by lightning and mutated, officially becoming Vecna . Convergence of Timelines [S4E7] Chapter Seven: The Massacre At Hawkins Lab