Promos
Especially during the 1960s, the three major networks, NBC, CBS and ABC, would show elaborate promos during the summer months of their upcoming fall schedule of that year. In 1961, CBS took the unusual step of airing a program entitled CBS Fall Preview Special: Seven Wonderful Nights, using, not the usual television voiceovers, but stars of several CBS shows to promote the upcoming shows, stars such as Ed Sullivan (The Ed Sullivan Show), Rod Serling (The Twilight Zone), and Raymond Burr and Barbara Hale (Perry Mason). The stars would appear and show previews of the entire lineup for one specific day of the week.
Read more about this topic: CBS