Malcolm creates the ice virus known as Gramm (sister to the fire virus, Plexton) and sends it into Sam's air conditioner for the purpose of having people turning cold against one another. Surely enough, it works on its victims - Sydney, Tanker and Amp. Sam, as Servo, must destroy Gramm in order to break the spell (and in the process, fend off the reserve virus, which is none other than Plexton!).