Seto recruited the Big Five to help him buy 51% of KaibaCorp’s stock to oust his stepfather, Gozaburo.
For a deeper analysis of the duels and hidden details within the Virtual World arc, check out this breakdown: Things You Missed In YU-GI-OH! The Virtual World Arc YouTube• Apr 28, 2018 Yu-Gi-Oh! - Episode 109 | Yu-Gi-Oh! Wiki | Fandom Yu-Gi-Oh! Duel Monsters Episode 109
The episode's emotional weight lies in the revelation of how Seto Kaiba seized control of KaibaCorp. Seto recruited the Big Five to help him
Episode 109 of Yu-Gi-Oh! Duel Monsters , titled (Japanese: "Escape from the Satellite Cannon!!"), serves as the climax to the duel between Seto Kaiba and Leichter (the Big Five’s leader) within the Virtual World arc. The episode is a critical character study of the Kaiba brothers' past and their loyalty to one another. 1. Narrative Core: The Betrayal Flashback - Episode 109 | Yu-Gi-Oh
At the board meeting, Mokuba revealed he was actually supporting Seto, giving him the final shares needed for the takeover.
Leichter uses "Injection Fairy Lily" to drain Kaiba’s life points and relies on "Satellite Cannon," which attacks from "space" (making it immune to monsters below Level 7 or 8, depending on the version).