Noticing this team of vigilantes, Brain Wave approached individual members of the JSA as psychiatrist Dr. Henry King. Implanting a post-hypnotic suggestions to assemble at the 1939 World's Fair Perisphere, he attached each of the JSAers (except Green Lantern) to a mental chamber which immersed them in a fantasy of wartime conflict. Brain Wave next assembled the All-Star Squadron at the World's Fair's Trylon tower, imprisoning each of them in the same device. However, once Green Lantern was connected to the device, his willpower proved too great for the chamber and its orchestrator, leaving it in ruins and King mentally unstable.