Greg Cox wrote:
Perhaps, but I think "Monster of the Week" being a term of derision, as in "I prefer ongoing arc plots to mere 'Monster of the Week' episodes," is of far more recent vintage, dating back, probably, to Buffy or The X-Files.
I can't resist the opportunity to mention Shaenon K. Garrity's webcomic Monster of the Week
, which is a series of very funny recaps of every X-Files
episode. It'd probably be even funnier if I remembered more of the episodes it's lampooning. But I think it does demonstrate the association of that phrase with that show.