“Luke Cage” star Mike Colter stopped by the Wall Street Journal’s WSJ Cafe to talk to me about why Black superheroes matter. We also talked about hoodies, Harlem and whether The Defenders (that’s Cage’s superhero crew) might someday match up with the better-known Avengers. If you’ve been binging on the new series “Luke Cage,” which was recently released on Netflix, or if you’re a Marvel fanboy or fangirl, you’re going to want to watch this on-camera interview.