Who Killed the DC Extended Universe?

Aquaman is finally here, showing us how different the future of the DCEU (DC Extended Universe) will look compared to Zack Snyder's failed original vision. Today we're reviewing just what went wrong: how an accomplished director led the DC Comics cinematic universe down a strange dark path, giving birth to a trilogy of comic book movies (Man of Steel, Batman v Superman, Justice League) which may go down in history as one of the most elaborate and expensive disasters in Hollywood history.