Similar to the model for their new prime time counterpart shows, television networks in the United States and Canada would film a preview special for the fall season.
The Saturday morning previews were generally aired on the network in prime-time, usually the Friday night before the new schedule began.
Hanna-Barbera Productions created a half-hour syndicated film called "Here Comes a Star" (1964) with Bill Hanna and Joe Barbera playing themselves promoting its newest series, The Magilla Gorilla Show.
The program, hosted by You Bet Your Life announcer George Fenneman, offered an inside look at the animation studio and a peek at the upcoming feature, Hey There, It's Yogi Bear.
Because the preview specials incorporated clips from a variety of sources with cross-platform licensing, it was legally impossible to sell them in syndication packages or release them on home video or streaming services.