Being invisible is not a great asset when you have to catch a giant ape on the rampage. And, if it’s your own pet monkey that has mutated into a giant, and you’re the only person who knows how to shrink him back to normal size, then it’s clearly your problem!Gennick, a mad scientist dogged by failure, finally succeeds in inventing a machine which makes people and objects vary in size. Desperate for revenge against those who mocked his earlier efforts, he successfully kidnaps and shrinks Magnapolis’ scientific community.The Invisible Man acts to stop him, but Foton is affected by Gennick’s invention, and the problem of freeing a few shrunken scientists becomes much more complex when he first has to capture an ape ten storeys high rampaging through the city.