"Divine Serpent" has just attacked Yami Yugi's "Dark Magician Girl"; if the attack is successful, Yami Yugi will lose the Duel. However, Yami Yugi uses the effect of "Legendary Knight Hermos", redirecting the attack to "Hermos" and removing from play "Obnoxious Celtic Guardian" in his Graveyard to have "Hermos" gain its effect until the end of the turn. Now "Hermos" cannot be destroyed by battle with a monster that has 1900 or more ATK, and Yami Yugi is safe.
The 3 Knights claim, that, by staking their lives, they shall protect their Master. Dartz grumbles and has to end his turn. Yami Yugi draws and claims that it's finally time to settle scores. Dartz shrugs and points out that his adversary, the "Divine Serpent Geh", has infinite ATK.
Yami Yugi recalls about how this is a battle for the sake of a lot of people. By combining the effects of all three Legendary Knights, he is able to deliver the finishing blow to Dartz's "Divine Serpent" with "Timaeus the Knight of Destiny", whose power tears a rift to the dimension in which the seized souls are being fed to the Orichalcos God.
Yami Yugi demands that Dartz free all his captured souls, but The Orichalcos God suddenly appears out of an inter-dimensional portal and snatches Dartz, to Yami Yugi's surprise. The 3 Knights are able to recall the souls of Yugi, Joey and Kaiba before the rift closes.
Rise of Atlantis
Atlantis emerges from the ocean and everyone knows that they must go there and fight the final battle. Kaiba, Joey and Yugi decide to go on their own. While walking back inside of the temple, Yugi's Millennium Puzzle is triggered: he finds the three Egyptian God Cards in the slots where Dartz had placed them back during when Yugi first freed Timaeus.
The rise of Atlantis causes a gigantic (200 meter tall) tsunami to form and head towards the mainland: it will reach the American Eastern Coast in roughly 1 hour.
Yugi returns the other two "Legendary Dragon" Cards to Kaiba and Joey. Dartz's face, projected by magic, then invites them to come over.
Upon reaching the palace's courtyard and finding the origin of the green beam of energy which is being emitted, they find Dartz's body turned into an ice statue which is sitting in a throne. It fades away. Dartz then magically projects his face in the area and claims that his God will be resurrected: instead of feeding off the souls of the Chosen Duelists, it will feed off of Dartz's own equally powerful offered soul.
The three attempt to attack the Great Leviathan with their monsters, but nothing even comes close to scratching it; meanwhile, its counterattack destroys nearly all of their monsters. Suddenly, the Leviathan pauses, as an aurora forms in the sky.
Turn 29: Yami
Yami Yugi draws "Attack Guidance Barrier". "Legendary Knight Critias" attacks "Divine Serpent Geh". Yami Yugi activates the effect of "Critias", having "Critias" absorb the effect of "Attack Guidance Barrier" from his hand. Now Yami can choose another monster on the field, and whenever "Critias" attacks or is attacked this turn, the attack will be redirected to the chosen monster. Yami chooses "Legendary Knight Hermos". (For dramatic effect, "Hermos" is shown flying alongside "Critias" and also attacking "Divine Serpent Geh".)
Since "Hermos" has been attacked, Yami Yugi activates its third effect by removing from play 3 monsters in his Deck ("Alpha The Magnet Warrior", "Beta The Magnet Warrior" and "Gamma The Magnet Warrior"). Now for the rest of the turn, whenever "Hermos" is attacked, its ATK will be tripled ("Hermos": 2800 → 8400/???) and the attack will be reflected back to the attacking monster (i.e. "Critias").
Since "Critias" has been attacked, its absorbed effect activates, redirecting the attack to "Hermos". Since "Hermos" has been attacked, its effect triples its ATK ("Hermos": 8400 → 25200/???) and reflects it back at "Critias". Since "Critias" has been attacked, its absorbed effect activates, redirecting the attack to "Hermos". Since "Hermos" has been attacked, its effect triples its ATK ("Hermos": 25200 → 75600/???) and reflects it back at "Critias". Yami Yugi declares that this is an infinite loop.
By anime mechanics, the ATK of "Hermos" reaches ∞. (Note: This would be impossible in both normal game mechanics and actual math for obvious reasons, as infinity is not a number and cannot actually be reached.) "Hermos" continues to reflect the attack back at "Critias". Since "Critias" has been attacked, its effect redirects the attack to "Hermos". Since "Hermos" has been attacked, its effect triples its ATK ("Hermos": ∞ → ∞/???) and reflects it back at "Critias". The infinite loop continues.
By anime mechanics, while the attack is still ongoing, Yami Yugi activates the effect of "Legendary Knight Timaeus", having it absorb "Critias" and "Hermos" in order to Special Summon "Timaeus the Knight of Destiny" (?/???) in Attack Position. Due to the first effect of "Timaeus the Knight of Destiny", its ATK becomes equal to the combined ATK of the absorbed monsters ("Timaeus the Knight of Destiny": ? → ∞/???). "Timaeus the Knight of Destiny" attacks "Divine Serpent Geh", causing both monsters to be destroyed in a Double KO.
Since "Timaeus the Knight of Destiny" was destroyed by battle, "Legendary Knights Timaeus", "Critias", and "Hermos" are revived. Since Dartz has 0 Life Points and no longer controls "Divine Serpent Geh", he loses the Duel.
Featured Battle: Yami + Seto + Joey vs. Dartz + The Orichalcos God - Part 1
Yami Yugi has "Legendary Knight Timaeus" absorb "Kuriboh" and the Spell Card "Multiply", to greatly increase its strength (by "ten thousand" times in the dub). "Timaeus" attacks The Great Leviathan again, with no success.
The Orichalcos God prepares to counter-attack.
Yami Yugi has "Legendary Knight Timaeus" absorb the power of "Big Shield Gardna" to create a "Full Barrier Shield".
Despite the Shield, all of Yami Yugi's, Seto's, and Joey's monsters are destroyed, except their Legendary Knights.
I though you said you couldn't revive the Great Leviathan without the souls of the Chosen Duelists. Yes, I did say that. But I simply substituted your souls with one of equal power. Yours! Brilliant deduction.
— Yami Yugi and Dartz
That thing looks like it could pick its teeth with an Egyptian God monster!
— Joey, about the Great Leviathan
That's it! I'm not doing to stand here and be threatened by some mutated hood ornament!
— Kaiba, about Dartz's fused form with the Great Leviathan
"When do you plan on launching your real attack, gentlemen?"
It's shown that Dartz isn't in control of the Great Leviathan as he thought, given it snatched him up the moment he lost against the Pharaoh.
"Big Shield Gardna" is again shown as a Normal Monster when absorbed by "Timaeus" (in the dub, the same mistake was made once before during the Duel against Dartz).
In the Japanese version, the Orichalcos God appears behind Dartz and snaps him up in its jaws. In the dub, Dartz turns glowy and vanishes as the Great Leviathan appears and before it snaps him up.
Though why the Great Leviathan wasn't simply removed altogether confused some viewers. As it was OBVIOUS that it was supposed to eat him.
The Knights' attacks on "Divine Serpent Geh" are obscured in the dub to avoid showing the swords piercing its body.
When the three Knights release the souls of Yugi, Kaiba and Joey, their hands are made to be glowy in the dub.
The following cards appeared in this episode. Cards in italics debuted here.