Zygor

Zygor, known as Satake in the Japanese version, along with Bonz and Sid, is one of Bandit Keith's former henchmen.

In the Duelist Kingdom tournament, they make up Bandit Keith's henchman. Keith wanted revenge at Maximillion Pegasus for humiliating him in the final match of the Inter-Continental Championship. When Keith finds out about Yugi Mutou, Joey Wheeler, and the rest of the gang, they believe they will get in their way, and seek to eliminate them.

When Joey runs away from the group towards a waterfall, Zygor beats him unconcious and he wakes up in cave with a Dueling Arena, complete with a Graveyard Field. Bonz challenges Joey to a Duel that he tricks him into thinking he must accept.

Bonz has the upper hand, as his Zombie-Type monsters gain a 30% ATK and DEF bonus because of the Graveyard Field, and when they are destroyed, they just regenerate, and become even stronger from "Call of the Haunted". However, when Yugi and the gang arrive, Joey manages to figure out the Zombie's main weakness and that is their DEF is 0. Using "Shield & Sword" to switch their ATK and DEF values, Joey wins the Duel. Bandit Keith then locks the gang in, beats up his three companions, and enters the Duelist Kingdom Finals.

Bonz, Sid, and Zygor are then seen right before the Battle City finals. The three reside in a nearby cemetery and trick people into giving up their Locator Cards. However, Yami Bakura is not intimidated by their act and challenges them to a Duel in which the winner gets all the Locator Cards, and thus goes directly to the Battle City Finals. Bakura wins in just a few moves, and then banishes them to the Shadow Realm (or Hell in the Japanese version). Zygor, Sid, and Bonz are never seen after Battle City since the Penalty Game Bakura inflicted on the three of them resulted in their deaths.

Deck
It is unknown what sort of Deck Zygor has. His only confirmed card in the anime is "Twin-Headed Thunder Dragon" which was seen on the screen of Seeker's laptop in episode 56 as he was looking at duelists' profiles which tells him their strongest card. As his "Twin-Headed Tunder Dragon" is a Fusion Monster it can be assumed that he has at least 2 "Thunder Dragons" and a "Polymerization".