Henry tried to escape Hawkins Lab by asking Eleven—his little “sister” in the program—to help him. He told her they were alike, that they could remake the world. It’s like that friend who asks you to help them move, only to reveal they’re actually robbing the place.
Eleven, being a good kid with a conscience, said no. She got so angry that she ripped his soul out of his body and threw him through a portal into another dimension. That’s the Upside Down—a cold, dead, hungry place.
Here’s where it gets really wild. In the Upside Down, Henry didn’t die. He merged with the environment. You know how a piece of bread left out too long starts growing mold that takes over? That’s basically what happened. Henry’s mind and the Upside Down’s nasty energy became one thing.
He stopped being a human and became Vecna: a half-ghost, half-hive-mind creature that controls demo-bats and eats suffering. His powers became about collecting people’s worst memories and using them like fuel. It’s the ultimate case of “I’ll show you all” taken literally.
