- Frank Robbins (credited)
- Mike Sekowsky (credited)
- George Roussos (credited)
- Milt Snapinn ?
- The Atom [Ray Palmer]; Major Mynah; General Naylor; Professor Richard Alvin; Jean Loring; Admiral White; "Jonah" Wale; Physalians (villains)
- Military officials and Ray Palmer are monitoring a test of Palmer's new invention when several soldiers vanish. The Atom and Major Mynah investigate and discover that aliens from Physalia are responsible and must be stopped.
Credits for script, pencils and inks confirmed from Julius Schwartz's editorial records, provided by DC Comics.
Story across 24 pages, but page 8 is 2/3 of a page and page 24 is 1/2 a page.
- Julius Schwartz
Letters submitted by Jim Vlcko, Jeffrey B. Siegel, Jeff Pierce, Rand Lee, and Mark Evanier.