A couple with financial problems decides to undergo the procedure of shrinking their bodies to a hight of five inches to be able to live an easy and care-free life but the wife changes her mind after her husband has already been downsized and now he has to build his new life alone.

On the eve of D-Day, a group of American soldiers are sent on a mission to disable a radio tower behind enemy lines and unexpectedly discover a laboratory where Nazis are conducting secret experiments.

After a motorcycle accident, Tetsuo is taken away to a military lab, and when his friend Kaneda tries to rescue him, he discovers that Tetsuo has been the victim of an extreme experiment.