With dramatic action and sky-high emotional stakes, its no wonder why Amazon Prime Video's "Invincible" has become one of the popular superhero TV shows of all time. The series has expertly adapted Mark Grayson's (Steven Yeun) morally tumultuous journey toward mastering his powers and growing into the man he's meant to be.  But as one might expect, that growth comes with more power — and even more powerful enemies. These are the 12 strongest characters in Invincible, ranked.