The Justice League: Earth's Mightiest heroes

The Justice League: Earth's Mightiest heroes is a spinoff series of The Batman series in 2004, the series follow the justice league at the beginning of their crime-fighting alliance and learn how to work together as a force for good and justice against other global threats, at the end of the first season, they get two new members in wonder woman and Aqua man and meet their arch foes in the legion of doom.

= Justice League = After the global threat of The Joining was eliminated by J'onn J'onnz and Batman, J'onn later returned to the Batcave to meet up with Batman. J'onn then transported them to a space station where Batman was introduced to a new "league" of heroes. This league, consisting of Green Arrow, Hawkman, Green Lantern, The Flash, J'onn and now Batman, is dedicated to saving the Earth against anymore global threats.