*Be warned, major spoilers ahead for “Black Panther: Wakanda Forever”* Marvel’s “Black Panther: Wakanda Forever” is expected to cross $600 million at the global box office this weekend. And it’s really quite the feat that co-writer/director Ryan Coogler was able to pull off, given the heartbreaking development process after losing actor Chadwick Boseman and trying to get the massive film completed while honoring his memory.