Jugger's origins and how he joined Black Hole are unknown. He is shown to speak in various computer like phrases, using words like "rebooted" and gauging things in percents.
Jugger took part in Black Hole's invasion of the continent of Omega Land. Unbeknownst to Black Hole's lower ranked members, the purpose of this invasion was to deplete Omega Land's energy so their leader, Von Bolt could absorb it into his chair and gain immortality.
However, Black Hole's invasion was combated by a group of COs from Orange Star, Blue Moon, Yellow Comet and Green Earth, who joined together to form the Allied Nations to fight Black Hole. An Allied Nations force led by Rachel, the younger sister of Orange Star's Commander-In-Chief Nell, thus traveled to Omega Land to drive out Black Hole from the content.
Jugger and the rest of the Bolt Guard fought against the Allied Nations throughout their campaign until they were finally defeated and Von Bolt's scheme to drain the continent of energy was foiled. Afterwards, as Von Bolt withered away and Hawke used his chair to restore life to Omega Land, Jugger appeared alongside the remaining members of the Bolt Guard as Kindle respectfully toasted to the Allied Nation's victory.
- A popular theory is that Jugger is actually a roboticized Flak, as the two share similar CO powers.
Advance Wars: Days of Ruin