For roughly three decades, American kids treated one specific four-hour window — Saturday, 8 a.m. to noon, on ABC, CBS, or NBC — as sacred. Bowls of cereal got soggy in front of the TV while Scooby-Doo, the Super Friends, or Bugs Bunny ran wall to wall, interrupted only by the toy and cereal commercials that funded the whole operation. That ritual didn’t fade out gradually because kids lost interest. It ended because of a specific chain of regulatory decisions, a cable-and-streaming shift in how children actually watched TV, and one network’s decision in 2014 to be the first to just stop.

How the Slot Became an Institution

The Saturday morning cartoon block took shape in the 1960s, and it got a major push when The Flintstones — originally a prime-time show — ended its evening run in 1966 and Hanna-Barbera pivoted hard toward producing content for the weekend-morning slot instead. Through the 1970s and into the ’80s and early ’90s, per The Saturday Evening Post’s history of the format, the block became appointment television for an entire generation, with shows like Super Friends and later Spider-Man anchoring the 8-to-noon window on all three major networks simultaneously.

The Regulatory Whiplash That Reshaped It

Children’s programming has always been a regulatory battleground, and the rules changed direction more than once. In the late 1960s, the advocacy group Action for Children’s Television began pushing back on cartoon violence and, especially, the volume of advertising aimed at kids, and in 1978 the FTC even attempted to ban TV advertising directed at children under six — a push that industry lobbying watered down into a compromise instead. Then came a hard reversal: when the Reagan administration’s FCC deregulated broadcasting in the early 1980s, it stripped away the advertising-time limits that had applied to children’s programming. That opened the door to what the industry openly called “program-length commercials” — cartoons built around toy lines, most famously He-Man and the Masters of the Universe and Transformers, produced in close coordination with Hasbro and Mattel, as detailed in History.com’s account of the deregulation era. Congress eventually pushed back with the Children’s Television Act of 1990, and the FCC followed in 1996 with rules requiring three hours a week of educational programming and banning toy-tie-in ads during kids’ shows — rules that made purely commercial-driven cartoon blocks far less profitable to produce, per the FCC’s own regulatory history.

The Slow Exit From Network Lineups

Once cable channels built specifically for kids — Nickelodeon, Cartoon Network, Disney Channel — could run animation all day, every day, the economic logic of the once-a-week network block collapsed. Advertisers followed the ratings to cable, and the broadcast networks increasingly farmed out their Saturday morning obligations to third-party blocks that satisfied FCC educational requirements without networks producing much original content themselves. The end point came in stages through the 2000s and 2010s, and the CW’s animated Vortexx block aired its final Saturday morning cartoon lineup on September 27, 2014, closing out what had been the last vestige of the traditional format on a major broadcast network.

Why Saturday, Specifically

The choice of Saturday morning wasn’t arbitrary — it was a scheduling gap networks filled almost by default. Weekday mornings and afternoons were already committed to soap operas, local news, and syndicated programming with established adult audiences, and prime time was far too valuable to hand over to children’s content. Saturday morning, when kids were home from school with no competing adult programming block to displace, was effectively unclaimed real estate, and once one network proved cartoons could pull strong ratings and ad dollars in that slot, the other two followed within a few seasons, turning an accident of scheduling into a fixed institution that lasted almost thirty years.

What Replaced the Ritual

Kids didn’t stop watching cartoons — they just stopped needing a specific morning to do it. On-demand cable blocks, then YouTube and streaming, made the appointment-viewing model that Saturday morning depended on structurally obsolete; there was no reason to wait until 8 a.m. Saturday for content that was now available at 8 a.m. any day of the week, or at 11 p.m. Tuesday for that matter. What got lost wasn’t the cartoons themselves — most of the actual shows are more accessible now than ever — it was the specific, communal, once-a-week ritual of the whole neighborhood’s kids being in front of a TV at the exact same time, bowl of cereal in hand, for four uninterrupted hours that belonged entirely to them.