The Martians attempt to take over a military base that has been used as a secure storage area for much of the information regarding the 1953 invasion. In particular they are seeking the location of Martians who are still in hibernation waiting to rejoin the invasion.

The Martians encounter another human disease, chicken pox which is crippling their invasion plans. They decide by harvesting human brains so they can produce a cure that will put the invasion back on track. Harrison's team race against time to stop them completing their project.