George Lowe, the actor who voiced superhero turned talk-show host Space Ghost on “Space Ghost: Coast to Coast” on the Cartoon Network for nearly two decades, died Sunday in Lakeland, Fla. He was 67.

Adult Swim would not be the juggernaut that it is today on Cartoon Network if not for Space Ghost. While the space-faring superhero was originally introduced as a serious crime fighter thanks to Hanna ...