The Atom [Ray Palmer]; Superman [Clark Kent; Kal-El]; Dav-Skiv; Dick Dillin (cameo); Joe Giella (cameo); Superboy (flashback); Jangles Jones; Julius Schwartz (cameo, as a cop)
Synopsis
While traveling via telephone transmission to visit Clark Kent, the Atom gets trapped by an electrical phenomenon that threatens both Clark's Metropolis neighborhood and a subatomic world that exists inside the telephone line.