What kind of villain is Loki? The Disney+ show turned to 'Avengers' for a reason.

For most of a decade, Marvel's God of Mischief hasn't needed much more reason to exist than the chaos he creates. 

Now though, Tom Hiddleston's Loki has a story of his own, and it's a multi-hour journey on Disney+ that promises to better define the contours of this complicated character. Already in the first episode, we've...