Another alternate-universe version of Squidward (possibly the same one) appears in "The Algae's Always Greener" - with a much larger role. He is not in the mirror, but instead the Squidward in the "alternative-universe" that Plankton visits.
Like the Mirror Monster, Alternate-Universe Squidward may be based off a theory on how the mirror world is filled with evil and demons.
"We paid ten dollars for this?"
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