Yu-Gi-Oh! episode 163: "Self Destruction"
Princess of Atlantis
A few years after the Orichalcos arrived, people of Atlantis started turning into monsters, including Iona, who was then killed by Dartz. Believing people to be evil, Dartz made it his mission to wipe out the people of the city. Dartz asked Ironheart and Chris to join him, but they both refused. In response he unleashed a number of Orichalcos Soldiers on them.
Ironheart, Chris and Skye led a group of refugees from the city to the nearby mountains. Here Ironheart searched for the creatures of ancient power; the knights Timaeus, Critias and Hermos. Together they fought in a battle against Dartz. However neither side was victorious.
Chris' spirit along with Ironheart and Skye's continued to live on. They met, Yami Yugi, who was chosen to wield Timaeus in his card form "The Eye of Timaeus". Ironheart and Chris saved him and Téa Gardner from the wreckage of crashed train.
Yami was unable to Summon Timaeus after he allowed Yugi's soul to be taken by playing "The Seal of Orichalcos". Ironheart and Chris worked to help Yami overcome this. They took him to a plain of lost souls, where he faced Yugi in a Duel. Afterwards when Yugi was confronted by an Orichalcos Soldier, Chris raced down on Skye's back to give him back the "Timaeus" card. However she is struck by one of Dartz's lightning bolts. She manages to hand Yami the card, before her spirit is killed once more.
When Yugi beat Dartz, Dartz was reunited with her in the spirit realm.