We're currently in the golden age of superhero blockbusters. Movies like Black Panther, Wonder Woman, Joker, and Avengers: Endgame routinely break box office records and compete for Oscars. Yet, Zack Snyder's 2017 behemoth Justice League--a veritable sure bet at the Hollywood casino--tanked miserably, and the behind-the-scenes reasons for the movie's demise are fascinating. The true story behind Justice League's failure is only half of the...