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==Themes and structure==
Although the first half of the anime's first season began on a whimsical note, the latter half established a noticeably darker atmosphere by introducing supernatural elements similar to those present in the original ''Yu-Gi-Oh!'' franchise, such as magic, the [[Shadow Game]]s, and various myths, along with Judeo-Christian subtext. The second season had a strong thematic presence built on destiny, with ties to the [[wikipedia:Cthulhu Mythos|Cthulhu Mythos]] of [[Wikipedia:H.P. Lovecraft|H.P. Lovecraft]] and associated horror fiction authors writing in the Lovecraftian horror, and drew on [[Wikipedia:Space opera|space opera]] as a plot device. The third season continued this trend, but with much greater emphasis on emotional torment, with alternate dimensions serving as its primary settings. The third season is easily the darkest, with large number of the main cast appearing to die over the course. Even though most later return, they are believed by both the viewer and the remaining characters to be dead. The fourth season continues character-driven plotlines established in the first season, such as [[Chazz Princeton]]'s desire to duel professionally, and the students that vanished in the abandoned dormitory.
The program is divided into episodes classified as "Turns". The title sequence and closing credits are accompanied by lyrics varying over the course of the series, with the former immediately followed by an individual episode's number and title. Eyecatches begin and end commercial breaks halfway through each episode; in the first season, there were two eyecatches per episode, usually showcasing the opponents and their key monsters for a given episode while in later seasons, a single eyecatch appears with only the duelists. After the credits, a preview of the next episode, narrated most frequently by KENN and Masami Suzuki, is made, followed by a brief "Today's Strongest Card" segment.
