Huh, I don't ever remember watching that episode. I looked up some of its plot and dialogue, and it feels more like a weak fanfic with some fun lines than an actual episode. I think the episode "Field Trip" was what put me over the edge. The idea of the antagonist being a giant hill of psychotropic green goop was just such a stupid idea.

But there's not much point to debating XF episodes at this point, is there? :)