Toward the end of Hanna-Barbera's affiiliation with Screen Gems (now Sony Pictures Television), John Stephenson (The Flintstones, etc.) was cast in the NBC soap opera, Morning Star, which ran from 1965-6. The series lasted less than a full year, and was one of three soaps produced by Screen Gems during that period. The only one remaining is, of course, Days of Our Lives. Morning Star, Days of Our Lives, & Paradise Bay were all from the same creative team, Ted & Betty Corday.
It's a pity, really, that Stephenson didn't land another soap gig after this. He could've fit right in anywhere else, but, as we've seen, he did some more primetime gigs after Morning Star signed off, and Screen Gems brought him back to guest on Temperatures Rising a few years later.
Here's a sample, from May 1966. I believe long time QM announcer Hank Simms has those chores here.
More on Morning Star at The Land of Whatever.