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