The Luna Ghost was a glowing ghost who was really old man Smithers. He appeared in the Scooby-Doo movie.
He haunted the Wow-O Toy Factory. He kidnapped Daphne and was stopped when he hit a toy pile. He was able to blow fire with a metal arm that could create a flame. With gas breath he blew on the flame and made fire.
He also made a cameo in Scooby-Doo! Mystery Incorporated as one of the costumes in the museum. The Slime Mutant is the next villain after all the villains like the Luna Ghost