As an 80s kid, cartoons shifted to WWF programming in the late morning. Superstars, Challenge and Spotlight, with All American Wrestling on Sunday.
Soul Train was mentioned above, I remember that coming on, too.
The channel that became the Fox affiliate in Philadelphia ran a Saturday afternoon block of old sci-fi / horror movies called Theater Bizarre. Saw a lot of Godzilla and Universal monster movies.
https://www.youtube.com/watch?v=FKv-1nxdB6U