When will we ever see this level of super hero on one tv show again, also the story lines were amazing they saved the best for last watching Superman show is true Power was great and Lex Luthor saved the world WOW!
The series is a continuation of its predecessor, taking up soon after Justice League ended. It is sometimes considered to be the same series as the original; the first season of Justice League Unlimited is referred to by the producers as the third season of Justice League. However, seasons referred to below treat Justice League Unlimited as a separate series.
It features a greatly-expanded League, in which the characters from the original series are joined by a number of superheroes (in the first episode, well over 50 characters appear), as well as a number of DC heroes who had made guest appearances in the first two seasons of Justice League.
Also unlike Justice League, which primarily consisted of two- or three-part stories with only light continuity between them, Justice League Unlimited features ongoing story arcs, the first involving the building conflict between the league and a secret government agency known as Project Cadmus. This plot line heavily builds upon events that occurred during the second season of Justice League, and has affected the plotlines of most of its episodes. It was resolved in a four-part story at the end of the second season of Justice League Unlimited. The third season story arc focuses on the Legion of Doom as the main villains, a loose-knit organization formed to combat the increased superhero coordination of the first two seasons.
Besides the addition of dozens of new League members, the show has changed format somewhat, though keeping the same Bruce Timm style artwork. The stories in the second and third seasons of Unlimited have, however, tended to align along a season-long story arc.
Also, towards the end of the series, certain characters became off-limits to the show. Namely any character mainly associated with Batman (aside from Batman himself), and every Aquaman character. This was due to un-related animated series The Batman, and the pilot of a Smallville-like series for Aquaman which wasn\\\'t picked up. Many have seen the decisions to outlaw these characters odd, seeing as Smallville and Justice League Unlimited make use of several of Superman\\\'s supporting characters, namely Lex Luthor. However, this ruling would seem to apply to JLU\\\'s use of Lois Lane, as she did not have a speaking role once the character was added to the cast of Smallville. On the other hand, the sibling superheroes who are featured in the League, Hawk and Dove, are among the few Teen Titans who do not appear in the television series depiction of that superhero team. Conversely, Speedy was able to appear on JLU soon after Teen Titans ended, due to the length of the third season of JLU\\\'s production.
Although he is featured prominently in the opening credits, and was one of the original members of the league in the previous Justice League series, the character of The Flash appears only fleetingly in the third season, though he has a more substantive role in the fourth and fifth seasons.
Justice League Unlimited, similar to the second season of Justice League, is animated in widescreen. The show also features a new theme song. It was the last Dini/Timm show in production, although there are currently two other, nonrelated animated series set in the DC universe: The Batman and Legion of Super Heroes. The two-part series finale was aired in the UK on February 8 and February 18, 2006 and in the United States on May 6 and May 13, 2006. Paul Dini, writer for the show, announced on January 25, 2006 via a reply to a blog entry that the show had been cancelled.