Episode Title:The Sphinx.Episode Description:A sphinx is turning Manhattan's intellectuals into blathering idiots as punishment for not solving his riddle. Meanwhile, Egon is depressed over getting old and starts to impose himself in the Ghostbusters' field work. (Note: Originally aired as the third last episode of the series, so it was set before "Back in the Saddle". As he mentions, Egon's only 39. Near the end, Egon calls Garrett "Ray" by mistake.)