Batman's first comic appearance in "Detective ... number of differences between the Batman of the modern DC Universe and the "Bat-Man" who debuted in 1939 on display in Detective Comics #27.

Cameo hinted at potential project featuring Batman and Superman. Appearance raised questions about Batman's version and set expectations for future DC projects ... the DCU’s first post-credits ...

Retailers upset that DC didn’t let them know that it was coming. Everybody upset with me for tweeting that a certain issue was a “real first ... is the man she’s trying to save: Batman.

From the first issue it was established that in DC ... bat costume (with paralysis fangs!), Bruce embraces his inner engineer and develops the “Bat-thumb,” a device that gives him Spider-Man ...