An American, former SWAT team leader and long distance sniper. McGuire was hired for the Death-T theme park at Kaiba Land, which was created to kill Mutou Yugi. He was put on a team with Johnny Gayle an the mysterious assassin to face Yugi and his friends in the first stage of Death-T. Each of them were promised a bounty of 10,000 yen for each opposing player they killed.
Kaiba rigged the game so that the three men on his team had real lasers that cause fatal electric shocks when fired, while Yugi and his friends were given toy guns.
When the three mercenaries discussed how they should take out their opponents, Gayle suggested that they leave it to him, as he was the expert in guerrilla warfare. As Gayle moved out, McGuire accused him of showing off and wanting the bounty all to himself.
Jonouchi Katsuya took out Gayle, by kicking him in the face, after running along the tops of the walls. Seeing this, McGuire and the mysterious assassin began shooting at Jonouchi. With Jonouchi acting as a decoy, Honda Hiroto used the chance to shoot at McGuire, hitting the sensor in his cyber vest head on, but to no effect. Realizing that his team's gins did not work, Honda called Yugi and Jonouchi back for a timeout.
After the timeout, Honda came on to the battlefield, offering a surrender. McGuire explained that it would not happen as they have been paid to kill him. Johji, who was hiding on Honda's back, tossed Anzu's operational gun, which Honda used to take-out McGuire and the mysterious assassin. Since Honda had previously set the laser to a non-lethal voltage, they were not killed.
In the Toei anime, McGuire is renamed to Black with a few alterations to his appearance like having a taller face and a black mustache. His background as a SWAT team leader was also removed.
Content compiled by AnimeList.moe from publicly available sources.
