Changes
→Duelist Kingdom
Kaiba takes Croquet hostage in the guestroom, threatening to snap his neck in a briefcase if Pegasus doesn't speak to him. Shortly afterwards, Pegasus appears on a screen and permits Kaiba to see him, if he can beat Yugi in a Duel. Saruwatari gives Kaiba 5 Star Chips, Mokuba had stolen earlier and Pegasus instructs Kaiba to wager them in a Duel against Yugi.
Kaiba confronts Yugi outside the castle and imposes a Duel. Yugi's friends try to advise him against accepting, as he already has enough Star Chips, but he switches to Dark Yugi and accepts. Kaiba uses the Duel as an opportunity to test his strategy to combat Pegasus' mind reading abilities. Since he was using [[Duel Disk]]s, he was able to stand further apart from his opponent and avoid face-to-face contact. Kaiba Summons "[[Blue-Eyes Ultimate Dragon]]", causing problems for Yugi, but Yugi fuses it with "[[Mammoth Graveyard]]", causing it to decay and lose [[ATK]] each turn. In the meantime, Kaiba is unable to draw new cards, as the Fusion, composed of "[[Polymerization]]" and the three "Blue-Eyes White Dragon" cards, is taking up four slots in his Duel Disk, while "[[Negate Attack]]" is occupying the fifth, without a chance for Kaiba to use it. As Yugi is about to win, Kaiba begins to suffer a gruesome hallucination where Mokuba was trapped inside the rotting body of the Ultimate Dragon, being smothered and begging for help; as Kaiba himself stood there staring helplessly in horror and despair, a younger Seto rushed to save him, only to fail and give the older Seto, who began rotting away as well, a glare of immense hatred. Kaiba, awakening from his nightmare, walks back five stones, each representing one hundred of the five hundred Life points he'd just lost to Yugi's last attack, which leaves him standing up on the edge of the castle. With a Fearless and confident and fearless look, Kaiba declares that he has nothing more to lose and that he would "gladly die for the cards", and threatens that if Yugi makes another wins the game with one more attack (which will lead to Yugi's victory), he will jump to his death, greatly horrifying Yugi and his friends. He then remarked that if their positions were reversed, he (Kaiba) would kill Yugi without a second's hesitation, much to heavily disgusting and infuriating Dark Yugi's disgust and fury. Seeing Dark Yugi hesitant in making this choice, Kaiba gave dared him an incentive by daring his opponent to "slit my throat with your card". Although Dark Yugi tries to attack, Yugi takes over and calls it off. Kaiba wins on the next turn, taking 5 of Yugi's Star Chips. Seeing Kaiba would use suicide as a weapon, Jonouchi becomes utterly disgusted, Anzu criticizes him, Yugi fears his other self and starts to resent Kaiba, and Dark Yugi would later comment that he and Kaiba will forever be enemies.
With 10 Star Chips, Kaiba enters the castle and confronts Pegasus. He insists on using the Duel Disks, but Pegasus isn't too keen. Pegasus accepts under the condition that Mokuba, who is stripped of his soul, holds the Duel Disk for him. Kaiba refuses to face his brother in such a way and agrees to duel without the Disks. Using his [[Mind Scan]], Pegasus overwhelms Kaiba by predicting every strategy and producing perfect counters against them with his overly powered toon cards, leaving Kaiba to discard his hand and rely on tactics instead, which was not much better as Pegasus read Kaiba's subconscious memorization of his own deck to maintain the upper hand. Eventually, Kaiba got reckless as his Blue-Eyes White Dragon was captured twice, which led to him accidentally triggering his own Crush Card virus that obliterated his deck, as it was composed mainly of high-level monsters. Refusing to surrender, he made one last futile move by reviving Saggi the Dark Clown, and apologizing to a soulless Mokuba and bidding Yugi farewell in his mind. Pegasus commended him for playing to the bitter end before killing the Dark Clown, which makes Kaiba lose by a [[deck out]]. Pegasus then traps Kaiba's soul in a "[[Soul Prison]]" card, as a [[Penalty Game]], and have both Kaiba brothers' empty bodies placed in separate dungeon cells.
