If you saw "Marvel's The Avengers" this weekend and stayed to watch the credits, you got to see an extra scene after the main titles ended.  Marvel Studios has a tradition of planting bonus scenes at the very end of their movie as a treat for fans, starting with Samuel L. Jackson's first appearance as Nick Fury at the end of "Iron Man."

But the scenes at the end of the previous movies have all been about setting up "The Avengers."  Now that the team-up finally happened, fans wondered what they would tease at the end of it.  The answer, obviously, was "The Avengers 2."

The mid-credits scene seems to have revealed who the villain of the next installment would be.  And for diehard fans of the comic books, the revelation was both shocking and highly satisfying (if the person sitting next to you at the theater audibly gasped, they obviously were true fans).  But if you aren't versed in Marvel lore, you might have been left scratching your head.

If you want to know more about who the mysterious figure is, keep reading.  Naturally, this is a big SPOILER, so if you haven't seen the movie yet, don't scroll down past this video.