The Walter Gundam first appeared when three of the Heavenly Kings attempted to stop Domon Kasshu from reaching the Gundam Fight Finals on time. For its pilot, Neo Hong Kong's Wong Yun Fat selected the powerful young fighter known as Allenby Beardsley of Neo Sweden. To make his 'Devil Allenby' unstoppable, Wong infected her with DG cells to increase her power, as well as mounting his own version of the Nobel Gundam's Berserker System on the Walter Gundam. The Walter Gundam was able to fight in several modes: a high speed ball, a mobile armor-like ball with two arm beam guns and finally as a three-legged mobile fighter. Allenby's agility allowed for incredibly fast movement in mobile armor mode. Under the double control of the Berserker System and the DG cells, Allenby was unable to control her actions.