Daimon was the only one allowed to help Seto Kaiba pay his stepfather Gozaburo Kaiba back with a loan to earn the name Kaiba. Daimon was angered that Seto never gave him any credit for his help, though Seto later told him that he never came up with any ideas, and only followed Kaiba's orders. After the Big Five helped Kaiba take over Kaiba Corp, Kaiba broke his deal with them, so they helped Maximillion Pegasus take over, until he was defeated by Yugi Muto. Seto fired them, but they trapped him in his virtual world, until he and Yugi destroyed their Five God Dragon, trapping them in the virtual world.They joined forces with Noah Kaiba and entered his virtual world. Since their bodies were destroyed, they targeted Yugi's gang to steal their bodies. Daimon went after Seto, using Jinzo as his deck master to destroy all Seto's trap cards. His strategy revolved around giving up life points to prevent Seto from using magic cards or to power up his Injection Angel Lily, employing cards to raise his life points in order to keep doing this. He had an almost-unreachable satellite monster, but it was destroyed by Seto's Blue-Eyes White Dragon, defeating Daimon and digitizing him.
Daimon was not destroyed, however, and returned alongside Konosuke Oshita, Shuzo Otaki, and Chikuzen Ooka to steal Katsuya Jonouchi, Shizuka, and Ryuji Otogi's bodies by force, but they were stopped by Noah. They then entered Hiroto Honda's body with Soichiro Ota, who had stolen it earlier, and dueled Yugi and Jonouchi at once. After one turn each by Gansley, Ooka, and Ota, and two turns by Otaki, Ooka took over for the remainder of the duel. He had the longest dueling time against Yugi and Jonouchi of any of the Big Five members. He summoned Five God Dragon, using all the Big Five's deck masters, and when it was destroyed, used a trap card to summon Berserk Dead Dragon to replace Five-Headed Dragon as deck master, but when Jonouchi turned Yugi's Black Magician into Black Magician's Knight and powered him up. He destroyed Berserk Dead Dragon, defeating the Big Five.
They tried to take the bodies by force, but Noah stopped them. He gave them no more chances following their defeat and imprisoned each of them in a different corner of the virtual world.
Daimon was killed along with Noah, Gozaburo, and the other members of the Big Five when Noah used a satellite attack to destroy the fortress the virtual world was stationed in, deleting the virtual world and anyone in it.
Yu-Gi-Oh! The Abridged Series
Lector has appeared in LittleKuriboh's Yu-Gi-Oh! The Abridged Series. He duels Kaiba, in which his ability is to destroy internet memes, which Kaiba's deck is full of. However, Kaiba defeats Lector by turning him into an internet meme, and he is digitized, repeating his original lines from the show.
He later returned alongside Gansley, Crump, and Johnson to chase after Joey, Serenity, Tristan, and Duke. He participated in the duel against Yugi and Joey alongside the other members of the Big Five in Tristan's body, and when Yugi defeated them, Noah banished them to the darkest corners of the internet. Lector was sent to fanfiction.net and was disgusted at the bad grammar, porn, and "un-american Japanimine".