The Infinity Buster (インフィニティ・バスター Infiniti Basutā) is a weapon used by X in the crossover game Marvel vs. Capcom: Infinite to destroy the antagonist Ultron Sigma. As the Infinity Stones were too dangerous to be used by themselves due to their great power, Dr. Light suggested Tony Stark create a device to harness their power. Using the technology from Sigma's laboratory in Abel City, Tony and Thanos created the Infinity Buster to harness the power of four Infinity Stones. After its completion, Tony gave it to X during the final battle against Ultron Sigma (now Ultron Omega). While charging the Ultimate Buster, X began shaking and had to use his Ultimate Armor to handle its great power, and is also supported by Dr. Strange and Morrigan's magic. It fired a powerful beam capable of destroying Ultron Omega.