A (male?!) mosquito army prepares for the attack. We see basic training, which includes an obstacle course (slapping hands, fly swatters), target practice on stuffed dummy human forms, and training for taking off and landing on "flattops" (sardine cans). The trainees get, literally, their wings. A scout arrives with photos and the attack is planned. The first wave sneaks in behind flowers, then opens a hole in the screened-in porch. A second wave arrives in an amphibious boat, then launches their attack; despite the human's preparations (DDT, flyswatter), he's launched high in the air. Finally, the returning troops land, but instead of reaching their sardine-can destination, they fall short in the water. The bug directing them turns around, and we see his crossed eyes.