"Doppelganger" may refer to any of the following:
- "Doppelganger": a Trap Card
- "Mimicat": a Spell Card, known as "Doppleganger" in the anime and "Doppelganger" in the manga
- "Doppel-ganger": a monster hologram, used by Seto Kaiba in artificial Penalty Games in the manga
- "Greenkappa": a Monster Card, known as "Doppelganger" in the Japanese version
- "Doppelganger Token": a Token Monster in the anime
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