Zigfried Von Schroeder is the main antagonist of the KC Grand Championship story arc of the Yu-Gi-Oh! second series anime. He is the CEO of Schroeder Corp, a rival of KaibaCorp. As the champion of Europe, he participates in Kaiba's KC Grand Championship under the name "Zigfried Lloyd". He is Leon von Schroeder's older brother.
Zigfried's family has a long feud with Kaiba's, which started when they were kids, as Zigfried's father's business partner Gozaburo Kaiba kept stealing business deals under his nose, leading to his premature retirement. When Zigfried took over the family business and decided to turn his company into the gaming business, he discovered that Kaiba did so with his own years prior, unintenionally robbing him of business opportunities. Finally, Zigfried chose to work on a device able to project Duel Monster cards, only to to find out that Kaiba came up with a better one, finally making him snap.
As revenge, Zigfried attempted to sabotage Kaiba's Grand Championship at Kaiba Corp. First, he set a computer to trap everyone inside, but the computer was defeated by Yugi Muto. Zigfried entered the tournament as Zigfried Lloyd, and easily defeated Insector Haga and Dinosaur Ryuzaki using his Valkyries Cards. He then dueled Katsuya Jonouchi and won.
As he was about to face his younger brother Leonhart in the final round, Kaiba realized his true identity and dueled him. Kaiba won, but Zigfried still had his main plan up his sleeve while Leonhart was dueling Yugi in the finals, Zigfried had him play a card called the Golden Castle of Stromberg, which was infected with a virus that deleted Kaiba's data. Leonhart, who had no desire to willingly participate in evil plans, and Yugi were able to stop it during their duel. After Yugi defeated Leon, Kaiba revealed that all his information was saved on a backup, and was never lost. Zigfried was utterly defeated, and Leonhart convinced him to make his corporation as good as Kaiba's without doing anything evil.