The Flying Green ghost was one of the ghosts supposedly destroyed by Robo-Buster that became part of the Spectral Mass.
History[]
The Flying Green ghost possessed Robo-Buster and attacked Paul Smart, but the Ghostbusters blasted the entity, forcing it to retreat and return to the Spectral Mass. It was later captured by the Ghostbusters, along with every other ghost that made up the Spectral Mass.