Warning: SPOILERS for Stranger Things season 4.
Ever since Stranger Things season 1 was released, one of the biggest questions has been: How many kids were tested on in Hawkins Lab, and what happened to them? Of course, Eleven is the 11th test subject; it was unclear if anyone came after her, and no one knew what happened to the rest of the kids who came before her. Stranger Things season 2 shed some light on this by introducing Kali, aka number eight.
Kali was older than Eleven and demonstrated a different set of powers, but the fact of the matter was that Kali and Eleven were both test subjects together at Hawkins Lab, as evidenced by Terry Ives' memories. But they weren't the only ones, and now Stranger Things season 4 sheds even more light on how many there really were, as well as what happened to them all. Thanks to the season's opening sequence and the memories Eleven re-experiences thanks to the Nina Project, audiences can determine how many there really were.
Related: Why Stranger Things Season 4 Took So Long To Happen
So far, it's been confirmed that at least 18 kids were part of Hawkins Lab's experiments, with multiple children — including twins — being younger than Eleven. Only a handful are specifically identified in season 4 - Six (who weirdly replaced Francine, the person who was Six in the Stranger Things: Six prequel comic), Ten, Two, and of course, One. Later on in volume 1, it's confirmed during the Nina Project flashbacks that there were 18 children.
It was heavily implied in Stranger Things season 4 that Eleven went berserk and killed everyone in the Rainbow Room — test subjects and scientists alike, leaving only Dr. Brenner alive. However, that wasn't what really happened at Hawkins Lab in 1979,
Read more on screenrant.com