Following the critical success of Batman: The Animated Series, DC's most iconic hero received the same in-universe animated treatment by the same creative team of Paul Dini, Bruce Timm and Alan Burnett that brought the Dark Knight to animation.
Due to the nature of Superman, the producers introduced a host of familiar faces into the DC animated universe (as they wanted Batman: The Animated Series to be more grounded in reality). Such guest appearances included The Flash, Kyle Rayner, Aquaman and Kent Nelson amongst others.
The third season was aired alongside episodes of The New Batman Adventures and packaged together as The New Batman/Superman Adventures.
The three part episode "World's Finest" was collected as a whole and distributed as The Batman/Superman Movie.