"Emperor's Key" was played in the following episodes:
- Yu-Gi-Oh! ZEXAL episode 55: "Portal of Doom" when Kaito and V start their Duel.
- Yu-Gi-Oh! ZEXAL episode 82: "Sphere Cube Calamity: Part 1" when Yuma dreams about the encounter between him and Astral, and Numbers 107: Galaxy-Eyes Tachyon Dragon.
|This listing is currently incomplete.|
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