Mystery Inc. evil doubles (Twin Dilemma)

Professor Louis is teacher of the archaeology class at a university.

Physical appearance
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Personality
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Scooby-Doo, Where Are You? (DC Comics)
Insert details here. (Twin Dilemma)

Appearances

 * Scooby-Doo, Where Are You? (DC Comics)
 * #64(a). Twin Dilemma