Ultra Magnus arrived on Earth in the late 20th century within the Japanese Generation 1 continuity, introducing advanced technological developments. He conceived and oversaw the construction of the global underground Autobot Road transport system. Appointed commander of the Scramble City project, he managed the creation of a mobile battle fortress. During this period, he fought Decepticon forces, delivering Optimus Prime’s upgraded trailer equipped with the Scramble Power Buster cannon. Ultra Magnus and Optimus Prime executed joint attacks like the Double Cross Kick to repel Decepticon threats. In *Scramble City*, Ultra Magnus directed the project from a concealed cavern base. After Decepticon spy Ratbat discovered the location, Ultra Magnus commanded newly completed Autobot combiners against Decepticon combiners. He ordered the deployment of Scramble City itself to secure victory, establishing his role in preparing Earth’s defenses before *The Headmasters*. By 2011, Ultra Magnus served as commander of Autobot City on Earth. When Decepticon forces re-emerged, he led Earth’s defense operations. During initial skirmishes, he clashed with the Decepticon ninja Sixshot, who commanded Earth-based Decepticon troops, leading to a sustained rivalry between them. Ultra Magnus’s story culminated in a decisive duel against Sixshot. Outmatched by Sixshot’s six transformation modes, Ultra Magnus fell to the Decepticon’s seventh, secret mode. With his final words, he urged the Autobots to protect Earth. Metroplex requested a burial on Earth, and Ultra Magnus was interred there. Notably, his body did not turn monochromatic upon death, unlike other deceased Transformers—a detail attributed either to his armored physiology or animation inconsistency. *The Headmasters* exists in a separate Japanese continuity distinct from the original American animated series, meaning Ultra Magnus’s death occurs only within this alternate timeline. His earlier technological contributions and leadership during the Scramble City era remained foundational to Autobot operations on Earth prior to his tenure as Autobot City commander.