SNL 48

It began with Johnny Carson wanting to take time off and NBC TV Network was looking for a weekend rerun replacement.
The World War II vet had a conversational approach with guests, and millions tuned in to watch his show. Between 1965 and 1975, NBC ran reruns of some of Carson’s greatest interviews on the weekend. The star asked to have the shows pulled and used during the week instead so he could take some time off. And thus, Dick Ebersol started developing something to air on Saturday nights.