There's an invasion underway: An army of brainless, bloodless phantoms, billions strong, is taking over our oceans, destroying our food supply, and turning our beaches into battle zones. After 600 million years of evolution, jellyfish are the planet's ultimate survivors, flourishing even in the face of climate change and pollution. Are they really mindless blobs or is the enemy smarter than anyone ever predicted? Could this be a real life war of the worlds?