Vecna's first appearance was in season four. Vecna is Brenner's
test subject. he is 001. Vecna was defeated by Eleven in the
lab, where he was pushed into the Upside Down. his main mission was to build an army against
Eleven in seasons two and three.
Strengths and Weaknesses
Strengths: cursing people, telekinetic powers, and grandfather clock
Weaknesses: fire, and Eleven
Vecna's plan in season four is to kill four people that has dealt with trauma
and is suffering, to open four gates that will connect together making one large
gate through Hawkins so he can take over the world. Even though he has his four
targeted, he still wants to kill Eleven for what she
did to him. We find out that Henry was Victor Creels son and that he killed his
mom and sister when he was a child.