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Justice League and Justice League Unlimited are American animated series about a team of superheroes which ran from 2001 to 2006 on Cartoon Network. It is based on the Justice League and associated comic book characters published by DC Comics.
After the second season, the show is renamed Justice League Unlimited, has a vastly expanded cast of characters, and largely changes from two-part episodes to single-episode stand-alone stories that often intertwine to form long (even season-long) story arcs. Combined, there are a total of 91 episodes, along with two crossover episodes of Static Shock in which the League appears.
The show is the last in a series of animated features that together constitute what is known as the DC animated universe (though Batman Beyond and The Zeta Project take place later in the same continuity). It consists of a series of eight television shows and four films, largely surrounding DC Comics characters and their respective mythos.

Source: Wikipedia