Extreme Ghostbusters Season 1 Episode 39

Production Supervisor/Coordinator Shannon Muir points out:

Sphinx" is actually production number 102, the first script that came in after the "Darkness at Noon" pilot. But for a variety of reasons it was the last to be finished, and in some markets the last to be aired. (I know for a fact it was the last one aired in Los Angeles, but many other markets report the last episode to be "Witchy Women" which I've always found interesting). It was originally intended to immediately follow "Darkness at Noon," but in the end that honor went to "Fear Itself" (production number 103).