Duel Monsters was animated by Studio Gallop and ran for 224 episodes, premiering in Japan on April 18, 2000 and concluding on September 29, 2004.
Capsule Monsters was an original miniseries commissioned by 4Kids Entertainment for broadcast in the United States, where it aired twelve episodes from September 9 to November 25, 2006.
Kaiba, obsessed with defeating Pharaoh Atem in a rematch, gathers the pieces of the Millennium Puzzle, planning to reassemble it.
Their duel is interrupted by Aigami who has been engulfed by the Millennium Ring's evil, as it was unearthed along with the Puzzle.
Yugi and Kaiba team up to defeat him, with Pharaoh Atem's spirit eventually showing up to win the duel.