The Creature King was one of Space ghost's villains. He used a mind control helmet to control the minds of space animals.
The creature king returned one last time, attempting to build an army to conquer the Ghost Planet and kill Space Ghost. However, Jan and Jace overheard the plans and warned Space Ghost, who enlisted the help of Batman to defeat the Creature King. At the end of the battle, Batman punched out the Creature King, knocking off his mind control helmet, which was crushed by one of his animals. It appears he was then eaten by his creatures. (Batman: The Brave and the Bold: "The Space Safari")