Luna Ghost

The Luna Ghost was the disguise of Old Man Smithers.

Physical appearance
He genuinely looked like an illuminous clown.

Powers and abilities
He can fly, glow in the dark and breath fire. He was able to blow fire with a metal arm that could create a flame.

Scooby-Doo (film)
He haunted the Wow-O Toy Factory and kidnapped Daphne Blake. He was stopped when he hit a toy pile. He was getting revenge by scaring off the workers because the owner refused to go on a date with him.

Appearances

 * Scooby-Doo

Scooby-Doo! Mystery Incorporated
A costume of the Luna Ghost was on display at the Crystal Cove Spook Museum. (Beware The Beast From Below)

Notes/trivia

 * Originally Old Man Smithers was supposed to be the main villain in Scooby-Doo, not Scrappy-Doo.