Mad Max

Short Answer: Before Thunderdome

One of the most intriguing characters in the series is Auntie Entity, who built and runs Bartertown. While a very rough-and-tumble place, it is an oasis of law in a lawless wilderness.

So... how did she do it? Why is this the only truly functioning society that we see, that has any resemblance to the world as we know it now?

And who is Entity? How did she manage to wrest a semblance of order out of this chaos?

We have seen that a female-led Max Max movie can be very successful, as can black-led action films like Blade, Black Panther, and I Am Legend. 

Maybe it's time to have a black woman be the main character of a Mad Max movie. My pick would be Letitia Wright, who played Shuri in Black Panther.

Since Max only meets Entity in the third movie, this will be a "Mad Max movie without Mad Max in it," but we have already seen movies helmed by Spider-Man's baddies without him in it. 

Also, we have a title (see above) that instantly defines and sells the movie.