Justice League, later known as Justice League Unlimited, was an animated TV series featuring the Justice League of America, including Superman, Batman, Wonder Woman and Supergirl, with a whole roster of other heroes. It ran from 2001 to 2006.
The first seasons featured a focused group of heroes, whereas the later seasons added "Unlimited" to the title of the show, and included a much wider selection of superheroes from across the DC Universe.