Saturn's tiny moon Enceladus, famous for its water geysers, has been revealed as a giant electromagnetic powerhouse whose influence extends over half a million kilometres through the ringed planet's magnetosphere. Analysis of 13 years of Cassini data shows the 500 kilometre wide moon creates a lattice like structure of crisscrossing electromagnetic waves known as Alfvn wings, that bounce between Saturn's ionosphere and the plasma torus surrounding Enceladus's orbit, reaching distances 2,000 times the moon's own radius. It changes our understanding of how small icy moons can influence their giant planetary hosts, with implications for the moons of Jupiter and perhaps even distant exoplanetary systems.