The Indo-Pacific lionfish is invading the Atlantic and Caribbean with catastrophic results. This non-native species has no local predators and is propagating at a rate that adversely impacts the coral reef habitats of the Eastern United States, Caribbean, and South America. Scientists monitor the situation, laypeople learn to manage the invasion, if only temporarily, and high school marine biology students take a close look at the feeding behavior of this voracious predator. This is a story of communities banding together for environmental protection and of proactive advocacy for sustainable habitats.