Actors, improvisers, comics or any kind of artist, really, shouldn’t miss Mike Birbiglia’s “Don’t Think Twice.” The comic-turned-actor/filmmaker journeys behind the curtain for his second film to put an honest lens on the inherent friction that occurs when artists need each other to succeed but also have their own dreams, egos and pursuits.

Arguably the two biggest heroes in comics have come together for “the greatest gladiator match in the history of the world,” a pretty tall order for DC Comics and Warner Bros., who have struggled to build the cache of their superhero universe over the years and watched in anguish as Marvel has become an unstoppable […]