Aquarius attached itself to the JSDF's Sat.1 recon satellite. When authorities attempted to get a visual using Sat.3, its camera was severely damaged by Aquarius. Using it's ability to project radiation, it utilized the Sat.1's solar panels to direct energy directly down at the Arc Station only for the building's shielding to deflect the radiation into the surrounding area, spreading radiation poisoning amongst the populace.
Aquarius soon took physical action when Tony launched himself into the stratosphere in order to combat it. In the ensuing battle, Aquarius gained an early upper hand with a surprise attack, even managing to disable Tony and draw him into itself, but the victory was short lived as Tony blasted his way out and soon finished off Aquarius.