For over fifty years, humanity has searched the night sky for signs we are not alone. This documentary takes viewers inside the high-stakes world of astronomers at the planet’s largest radio telescopes, tracing the hunt for extraterrestrial intelligence from secret 1960s meetings to today’s cutting-edge science. Investigate the enigmatic Wow! signal, the baffling Lorimer Burst, and the mystery of Tabby’s Star—hinting at a possible alien megastructure. At Green Bank Observatory, scientists deploy powerful new technology in the ultimate search for a Type II civilization and the truth behind the Great Silence.