 As J.B. is working on the computer, all of a sudden a mysterious virus causes all the computer systems in Cross World City to malfunction, after which he, Kaitlin and Ryan are attacked by Skugs. After defeating them, the Troopers enter into Professor Hart s lab, only to find that the hardware has also malfunctioned, and Hart is somewhat acting evil lately. They soon find out that Grimlord is behind the virus, and now they have to find the source of the virus in a hidden place in order to shut it down for good. But little do the Troopers realize that they are falling into a trap set by Grimlord not only on air, but on land as well. Can the Troopers find a way to destroy the foes and stop the virus before they get ambushed too much?