Ep. 20: Daimon, the mechanical butler, serves as the final Game Master in a duel against Yugi.
Aired on August 15, 1998

Daimon, an elderly man sustained by machinery, acts as the final Game Master in a duel against Yugi. During the match, he discloses that Seto Kaiba was once a kind individual. Daimon urges Yugi to help restore Kaiba's lost goodness. This revelation highlights the contrast between Kaiba's past character and his current demeanor. The encounter serves as a pivotal moment where the butler attempts to influence Yugi's actions regarding Kaiba's moral state. The duel represents the culmination of the Game Master series, with Daimon presenting this final challenge and message to the protagonist.
Episodes
- Ep. 16 · Hair's Breadth Turnabout: The Crisis of the White Robes
- Ep. 17 · A Last Minute Match - The Model that Invites
- Ep. 18 · Yugi and Imori discover the forbidden Dragon Block game which threatens their souls.
- Ep. 19 · A fierce popularity contest unfolds with Honda backing Miho against the arrogant Kaoruko Himekoji.
- Ep. 20 · Daimon, the mechanical butler, serves as the final Game Master in a duel against Yugi.
- Ep. 21 · Kaiba kidnaps Yugi's grandfather and dares him to Death-T, an indoor amusement park full of death traps.
- Ep. 22 · Yugi and friends navigate Death-T laser tag and giant killer robot challenges
- Ep. 23 · Yugi Faces Mokuba in Capsule Monster Chess Before Dueling Kaiba at Death-T 5
- Ep. 24 · Yugi faces Kaiba's Blue-Eyes while Jonouchi and Miho fight Ryuichi and Aileen.