Following White Fang's takeover of OZ's lunar base and the still incomplete Libra, Bulge became OZ's last bastion in space. In response, the OZ space force upgraded the space fortress, removing the space port in the front and adding a powerful new beam cannon that draws power directly from the fortress' power block. This new weapon was simply known as "Bulge Cannon".
The White Fang later used their newly acquired Virgo II mobile dolls to launch an attack against all remaining OZ forces in space, including Bulge. The space fortress's defenders were composed of Taurus mobile suits, which made use of obsolete laser beam rifles that could bypass the Virgo's planet defensors by simply piercing their magnetic fields. The Taurus suits bought enough time for Bulge to fire its main cannon at 80% output, destroying much of the White Fang forces, including White Fang officer Sedici's ship. However, the battle ultimately ended with White Fang's victory when Bulge was destroyed by Gundam Epyon while charging for another shot.