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Our oceans are increasingly inhospitable, with rising temperatures, growing toxicity, and overfishing pushing many marine species to the brink of collapse. Yet, one creature is thriving amidst this turmoil: the jellyfish. As expert Lisa-ann Gershwin reveals, the proliferation of jellyfish serves as a stark indicator of the dire state of our oceans while showcasing the resilience of these remarkable beings. Recent reports of giant jellyfish swarming Japanese fishing grounds and stinging invasions in the Mediterranean highlight their growing dominance. Jellyfish flourish in conditions that are unfavorable to fish—fewer predators, warmer waters, and abundant spaces for larvae. Our practices, such as mechanized trawling, habitat destruction, pollution, and climate change, are creating environments that favor jellyfish over fish. While often mesmerizing, jellyfish are simple organisms that have adapted to thrive in these altered ecosystems. Gershwin shares captivating stories of both beautiful and dangerous jellyfish, revealing their intriguing behaviors and adaptations. She traces their history back to the Proterozoic era, when jellyfish were the dominant marine predators. Ultimately, the narrative of jellyfish reflects the broader story of our oceans, offering a compelling and urgent examination of their intertwined fates.