| Issue | #53 |
| Published | April-May 1964 |
| Cover Price | 0.12 USD |
| Pages | 36 |
| Editing | Murray Boltinoff; George Kashdan |
| Characters | Atom [Ray Palmer]; Flash [Barry Allen] |
| Genre | Superhero |
| Pencils | Bob Brown |
| Inks | Bob Brown |
| Reprinted | in Brave and the Bold Team-Up Archives, The (DC, 2005 series) #1 (March 2005) |
| Characters | Atom [Ray Palmer]; Flash [Barry Allen]; Iris West; Harry; Dr. Willis Stanton; Larnus (first appearance); Arbellice (first appearance); Zarn (first appearance); Attila-5 (first appearance; villain) |
| Synopsis | Flash and Atom must stop a microscopic world from expanding. |
| Genre | Superhero |
| Script | Bob Haney |
| Pencils | Alex Toth |
| Inks | Alex Toth |
| Reprinted | in Action Comics (DC, 1938 series) #406 (November 1971); in Greatest Team-Up Stories Ever Told, The (DC, 1989 series) #nn; in Brave and the Bold Team-Up Archives, The (DC, 2005 series) #1 (March 2005) |