The first poster look of its upcoming Season 5 shocked ... the military after El because they believe she's responsible for ...

That means that for the next few weeks, prepare to see the name "Vecna" all over your social media feeds. With tens of thousands of tweets, Vecna is already the breakout star of the season.

Ahead of season 4, part 2, here's everything to know about the mysterious Vecna. In episode 7, Vecna is revealed to be Henry Creel (played as a youngster by Raphael Luce), the son of Victor Creel ...