A worldwide hero and modern prophet is faced with losing everything as a stronger hero rises. He is now forced to defend his title to stay on top of the world that he controls.

How about something like this:

"When a new superhero supplants him as head of the league of champions, the former leader must fight to reclaim his old position when he discovers the usurper secretly works for the league of Evil"

Hope that helped, good luck with this!

You could have added character function?

good idea