The commentary of "Time Keeps on Slippin'" clearly states them as human, but living on a world that is not Earth.
It is the same to assume that Amy Wong is a Martian just because she lives on (or was born on) Mars. Listen to the commentary, that will clear it up for you. And you are right, the category was a mistake. So I removed it. --Sviptalk 20:30, 8 August 2009 (UTC)
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