The invisible creatures eventually attack and kill the military personnel at the airbase in order to take over control of the radar station's nuclear reactor; two of them dial-up the power to very dangerous levels. As they do so all the creatures suddenly become visible. Their now visible bodies are revealed to be the missing brains with spinal cords stolen from their victims; their spinal cords have become very flexible and have now sprouted tendrils. These mutations also allow the brain-spine creatures to move quickly and even leap distances; each brain-spine has also developed a pair of small eyes at the ends of extended eye stalks.