The series ran from November 17, 2001, to May 29, 2004, on Cartoon Network. It is based on the Justice League of America and associated comic book characters. The series ended after two seasons, but was followed by Justice League Unlimited, a successor series which aired for three seasons. Kevin Conroy reprised his voice role as Batman from Batman: The Animated Series (1992–1995), The New Batman Adventures (1997–1999), and Batman Beyond (1999–2001)