There was little fanfare around “ Scooby-Doo, Where Are You!” when CBS launched the Saturday-morning animated series about four crime-fighting teens and their talking Great Dane, Scooby-Doo. That was Sept. 13, 1969. Fifty years later, “Scooby-Doo” remains one of TV’s most iconic animated series, spawning a slew of spinoffs, five big-screen movies and a merchandising...
