Kaiba and Noah in “Unfinished Business”

[thinking] Yugi and his friends can deal with the Big Five… I've got bigger problems! [flashback to Noah]

Gozaburo Kaiba only had one son. That was me, Seto! [flashback ends]

[thinking] Noah's story has to be a lie! He claims that the man who adopted me is his father! But based on his story, that would make Noah the same age as me! And he's clearly just a snot-nosed little kid! I wonder if the Big Five put that kid up to all this. Those corporate slime balls would do anything to take over KaibaCorp. But they're too dim-witted to come up with a scheme like this! There's a piece to this virtual puzzle that I still need to find! And when I do, all of this nonsense will be clear! But the first thing I have to do, is find Mokuba, and rescue him from Noah's control before that little punk completely brainwashes my brother! Then I'll show Noah that no one disrespects my family and gets away with it!