Which animated series was the first to air in prime time and had five total seasons?

The Flintstones holds a significant place in animation history as the first prime-time animated television series. Premiering in 1960, it set a precedent for future animated shows aimed at older audiences, particularly adults. The series cleverly parodied suburban family life in a prehistoric setting, using humor that resonated with contemporary social issues of the time. Over its run, The Flintstones accumulated a total of five seasons, solidifying its status as a pioneering animated show that influenced both television and popular culture. Its success demonstrated that animation could transcend children's programming and find a substantial audience in prime-time television, paving the way for other animated series that followed.