The Real Ghostbusters (1986)

S02E11 Egon's Ghost

During a mishap involving one of his own gadgets, Egon finds himself transformed into a ghostly figure. As he drifts between the world of the living and the afterlife, the Ghostbusters scramble to create a new device to bring him back before he disappears forever. Will their ingenuity be enough to save their friend from eternal separation?