History Anime / YuGiOhTheDarkSideOfDimensions

* ConspicuousCG: The Egyptian Gods, several of Kaiba and Yugi's monsters, Kaiba's machines and plane, and Aigami's cubic monsters are all 3D CG creations.

* AlternateContinuity: As a sequel to the manga timeline and ''not'' the anime timeline, instead of starting the events of ''Anime/YuGiOhGX'', Kaiba was unable to let go of his obsession with beating Atem while acknowledging Yugi as a duelist due to being absent for the Ceremonial Duel. This results in the plot of the movie.

* {{Bowdlerise}}: In the dub the Kudaragi gang just bullies Aigami, while in the subs they bully him, sexually harass him, and comment on how cute he looks.
* BreakingOldTrends: This movie marks the first time that the Life Point gauge starts at 8000 rather than 4000.

* NewRulesAsThePlotDemands: The rules of Dimension Dueling are vague and never fully fleshed out, allowing the duelists, Aigami in particular, to make moves that seem rather random at times.

** Shadi is only shown in flashbacks [[spoiler:and is revealed to have taken care of Aigami, Sera and other struggling children in Egypt.]]

* AnotherDimension: Aigami's Quantum Cube can trap people in other dimensions. Anyone not part of the dimension originally will die, and he wants to stop Kaiba and Yugi because [[spoiler:if the Pharaoh is reborn into the world, he and the rest of the Plane will lose their powers and be bound to the world they're in]].

* BroughtDownToNormal: At the end of the movie, [[spoiler:due to Atem appearing in the physical world once more, Aigami, Sera, Mani, and the other Plane children lose their powers]].

** The movie takes place after the anime in the west, turning Kaiba not being at the Ceremonial Duel into one of these. (He was there in the anime but not in the manga.)

** The English dub aligns with the [=4Kids=] dub names as opposed to the manga names for the sake of familiarity, despite the movie following the manga continuity closer. However, promotional material indicates that the English dub will be treated as being in the continuity of the anime, justifying this.

** Played straight for the rest of the movie, naturally. Diva can only be forced to give up one of the pieces he stole through a duel, and Kaiba challenges Yugi for the other piece.

* SuspiciouslySimilarSubstitute: Aigami, Sera and Mani are this to Marik, Ishizu and Rishid. Aigami's backstory is similar to Marik's, Sera takes Ishizu's role as a sibling who wants to lead him away from darkness, and Mani is like Rishid in that he's selflessly loyal to Aigami no matter what.

** The Egyptian God Cards that were sealed along with the Millennium Items remain as unaddressed as the rest of the Items, [[spoiler:except for Obelisk, and even that has its own unexplained issue]].

* AnotherDimension: Aigami's Quantum Cube can trap people in other dimensions. Anyone not part of the dimension originally will die, and he wants to stop Kaiba and Yugi because [[spoiler:if the Pharaoh is reborn into the world, he and the rest of the planners will lose their powers and be bound to the world they're in]].

** There's also a more subtle one, regarding Aigami's vendetta against Yugi and his friends. While he's watching the main characters chatting over ice cream, he makes vague mentions of revenge and eradicating evil, and that 'no one is more evil than him!' while focusing on a shot of Yugi. [[spoiler: A few scenes later and the movie makes it clear that he wasn't focused on Yugi at all: his real target is Bakura.]]

* BalanceBuff: Meta-wise. Yugi and Kaiba use their trademark cards like Gaia the Fierce Knight, Vorse Raider, Dark Magician, Blue-Eyes White Dragon, etc. However, they're variants of the originals that have stronger effects and sometimes higher stats, which makes them more useful in today's metagame.

* BroughtDownToNormal: At the end of the movie, [[spoiler:due to Atem appearing in the physical world once more, Aigami, Sera, Mani, and the other planners lose their powers]].

** Ryou Bakura finds it difficult to relax with his friends knowing Aigami can make people vanish, and could be watching them as they speak. He ''is'' watching them as they speak.

** Shadi's appearance is changed slightly, he [[spoiler:raised Aigami, Sera, Mani, and the planners]], and he has powers he's never had before in any continuity, such as [[spoiler:wielding the Quantum Cube, which can directly erase people from existence and send them to other dimensions]]. He can also transfer his powers to others, but they will lose them if the Pharaoh is reborn into the world a second time.

* DemotedToExtra: Zig-zagged with Ryou Bakura and played straight with Duke Devlin. In the anime Bakura was demoted to a side character who occasionally had a role in the plot until the Millennium World Arc, while in the manga he was more prominent. In the film, Bakura has a prominent role in Aigami's backstory and hangs out with Yugi and friends frequently, but is then banished for the last third of the movie and what happens to him is never addressed. Duke was a main character in several seasons of the anime and a side character the manga, but is reduced to a minor character in this film as he only appears in 3 scenes.

* LighterAndSofter: In contrast to the manga's frequent depictions of blood and death, characters are sent to other dimensions and bloodlessly attacked by shadows, though they can still die if not rescued, and Aigami's backstory involves [[spoiler:Dark Bakura going on a murderous rampage]].

* MindScrew: The other dimensions are very mindscrewy in appearance and function; anyone not part of them to begin with will disintegrate, and one such dimension is apparently [[spoiler:the afterlife.]] Aigami's Quantum Cube [[spoiler:that originally belonged to Shadi]], and how Kaiba can counteract it with his duel disk, are also never fully explained.

* ViewersAreGeniuses: A lot of Aigami's motives and methodology in the Japanese version references quantum mechanics, a field of science that tends to be confusing and difficult to understand even to those that study it.

*** It is heavily implied in VideoGame/YuGiOhDuelLinks that the other dimension that Kudaragi's gang are being sent to, is the game's world, meaning they are now trapped as digital entities in the game.

** Obelisk the Tormentor is a god, not a monster (as it's unaffected by Aigami's Cubic Mandala, which negates monster effects).

** Obelisk the Tormentor is a god, not a monster.

* AmbiguouslyGay: If one pays close enough attention after the graduation rehearsal, they'll see there's a brief moment where a female student grabs another female student by the arm and they both walk off-screen. While their intentions are unknown, it's implied that may be lesbians.

* AmbiguouslyGay: If one pays close enough attention after the graduation rehearsal, they'll see there's a brief moment where a female student grabs another female student by the arm and they both walk off-screen. While their intentions are unknown, it's implied that may be lesbians.

* HoistByHisOwnPetard: Aigami tries to prevent Atem's return, but Aigami's attempt to get rid of Kaiba and then Yugi, eventually leads to Atem's return in a duel against Aigami. A duel that wouldn't have happened if Aigami and the others just live in peace, as outside that duel, Yugi and Kaiba had no way to bring Atem back. (This is actually hinted at during the ''Transcend Game'' prequel manga, as even at that point Kaiba is already willing to go to the afterlife just to duel Atem, meaning he doesn't see any other way.)

** Diva gives one of the two puzzle pieces he stole to Sera, on the off chance someone manages to get the piece he has. He didn't anticipate her giving it to Yugi, though.

* SerialEscalation: Aigami first tries to prevent the Puzzle from being found and completed by stealing its pieces. When that fails, he tries to kill Kaiba, who plans to put the Puzzle back together to duel Atem. When that fails, he tries to kill Yugi, as killing him would ensure the Pharaoh had no vessel to return to, as well as kill Bakura to [[spoiler:get revenge for Shadi]]. When ''that'' fails, [[spoiler:the Millennium Ring possesses him and goads him to try and kill them both]].

* SkepticNoLonger: Kaiba, in the dub, was infamous for [[TheScully constantly denying]] any of the magic he encountered after season 1 and chalking it up to faulty holograms, illusions, and other excuses, only stopping towards the tail end of season 5. Even in the original manga, which this movie is mainly based on, Kaiba expressed utter indifference to magic at best and utter denial at worst, most prominently in Battle City [[labelnote:note]]Except for one occasion [[EarlyInstallmentWeirdness early on]] where Dark Yugi's shadow games inspired his Solid Vision system.[[/labelnote]]. In this movie, Kaiba actively acknowledging the existence of magic and trying to forcibly bring Atem back is an integral part of the plot. It's worth noting [[SufficientlyAnalyzedMagic he does not believe magic, however, to be in any way not explicable and wieldable through science]], [[spoiler: and repeatedly manages to back this up, countering Aigami's Plana powers and in the end ''forcing his way into the afterlife'']], so while he has finally accepted that magic exists, he seems to believe that technology is still superior.
* SlidingScaleOfIdealismVsCynicism: Despite Aigami's universe-shattering power, implied and osncreen deaths, and a storyline about unwillingness to accept loss, the movie is ultimately hopeful and idealistic.

* VisionaryVillain: Aigami believes ''so'' much in [[spoiler:Shadi's vision of a better world beyond dimensions]] that he thinks Yugi's world is static and has no meaning. [[spoiler:The Millennium Ring]] takes his wish even further by trying to create [[spoiler:a new world of darkness.]]

** The Egyptian God Cards that were sealed along with the Millennium Items remain as unaddressed as the rest of the Items, [[spoiler:except for Obelisk]].

* MugglesDoItBetter: Kaiba's technology is so advanced it solves the Puzzle in 5 and a half hours, while it took Yugi eight ''years'' to solve it.

* BrokenAesop: Kaiba spends much of the film in an obsessive state, trying futilely to see Atem while being told that Atem has moved on and isn't coming back, with [[spoiler:Yugi recompleting the Puzzle to prove it]]. Throughout the movie Yugi and his friends have moved on from the loss, Yugi gives Kaiba a speech directly telling him to move on, and [[spoiler:Atem himself takes the Puzzle to the afterlife with him]]. Kaiba then decides that [[spoiler:if he can't bring Atem back, he'll meet Atem by going to the afterlife instead, leaving Mokuba to run his company in his stead]].