| Issue | #21 |
| Published | May 1983 |
| Frequency | monthly |
| Cover Price | 0.60 USD |
| Pages | 36 |
| Editing | Roy Thomas; Nicola Cuti (assistant) |
| Characters | All-Star Squadron [Atom [Al Pratt]; Hawkman [Carter Hall]; Superman (Earth-2); Firebrand [Danette Reilly]; Dr. Fate]; Cyclotron (villain) |
| Genre | superhero |
| Pencils | Jerry Ordway (signed) |
| Inks | Jerry Ordway (signed) |
| Characters | Justice Society of America [JSA; Hawkman [Carter Hall]; Johnny Thunder (Earth-2); Johnny Thunder's Thunderbolt; Wonder Woman (Earth-2); Dr. Fate; Starman [Ted Knight]; Green Lantern [Alan Scott]; Dr. Mid-Nite; Sandman [Wesley Dodds]; Atom [Al Pratt]]; All-Star Squadron [Liberty Belle; Johnny Quick [Johnny Chambers]; Robotman [Robert Crane]; Steel [Hank Heywood]; Firebrand [Danette Reilly]; Tarantula]; Superman (Earth-2); Cyclotron (intro, villain); Deathbolt (intro, villain); Ultra-Humanite (villain); Dragon King (flashback); Mayor Laguardia; Superman's Citadel |
| Genre | superhero |
| Script | Roy Thomas |
| Pencils | Jerry Ordway |
| Inks | Mike Machlan |
| Colors | Gene D'Angelo |
| Letters | C. McCarthy |
| Notes | Follow-up to Powerstone stories in Action Comics (DC, 1938 series) #47 & Superman (DC, 1939 series) #17. Cyclotron wears a costume identical to the final one worn by the Golden-age Atom. Ordway's Superman is styled like Shuster's original Superman. Trylon and Perisphere become All-Star Squadron Headquarters. Story continues in next issue. |
| Script | Roy Thomas |
| Letters | typeset |
| Notes | Includes letters reviewing All-Star Squadron Annual #1; last page shared with a DC Coming Comics ad |