What was the first animated TV show to be broadcasted in primetime?

"The Flintstones" was already prehistoric by design when it premiered on Sept. 30, 1960. Sixty years after its launch, primetime TV's first animated series seems even older in some ways, surprisingly contemporary in others, and still gets callbacks in today's popular culture. The classic TV gem (likely still in carbon form at the time), a takeoff of Jackie Gleason's "The Honeymooners" and the longest-running primetime cartoon until overtaken by "The Simpsons," follows Fred and Wilma Flintstone, a suburban Bedrock couple with mid-20th Century sensibilities living in 10,000 B.C.

Source: USA Today