| Issue | #223 |
| Published | March-April 1970 |
| Cover Price | 0.15 USD |
| Pages | 36 |
| Editing | Julius Schwartz |
| Notes | Credits for pencils and inks confirmed from Julius Schwartz's editorial records, provided by DC Comics. [July 2007]. |
| Characters | Atomic Knights |
| Genre | science fiction |
| Pencils | Murphy Anderson (signed) |
| Inks | Murphy Anderson (signed) |
| Notes | Credits for pencils and inks confirmed from Julius Schwartz's editorial records, provided by DC Comics. [July 2007]. |
| Characters | Adam Strange; Alanna; Edna; Edna's husband; prehistoric Rannian dinosaurs; Sardath; Zhoran Tew; Mortan |
| Synopsis | Mortan steals an invention from Zhoran Tew and uses it to create force fields and prehistoric dinosaurs to threaten Ranagar, but Adam defeats him when he figures out the weakness of the force fields. |
| Genre | science fiction |
| Script | Gardner Fox |
| Pencils | Carmine Infantino |
| Inks | Bernard Sachs |
| Notes | First appearance of Mortan; also appears in Mystery In Space #80, #91. |
| Reprinted | From Mystery In Space (DC, 1951 series) #62 |
| Script | Julius Schwartz |
| Letters | typeset |
| Notes | Letters from: David AJ McGlone; Jerry Wilson; Rand Lee; Gary Skinner. |
| Characters | the 3 Herbert brothers; U.S. Army doctors; hermit; U.S. government investigators |
| Synopsis | The Herbert brothers have absorbed radiation from a meteorite and become scientific geniuses, so the Army puts them to work solving problems and inventing until they vanish. |
| Genre | science fiction |
| Script | Gardner Fox |
| Pencils | Irwin Hasen |
| Inks | Joe Giella |
| Notes | One of the Herbert brothers is named Jeb. |
| Reprinted | From Strange Adventures (DC, 1950 series) #21. |
| Characters | Atomic Knights [Gardner Grayle; Douglas Herald; Marene Herald; Wayne Hobard; Hollis Hobard; Bryndon]; Dalas; Khagan; Khagan's army |
| Synopsis | Wayne and Hollis are held prisoners and Bryndon and Gayle follow one of their prisoners, Dalas, to Washington DC to free them and disable an ultraviolet ray. |
| Genre | science fiction |
| Script | John Broome |
| Pencils | Murphy Anderson |
| Inks | Murphy Anderson |
| Reprinted | From Strange Adventures (DC, 1950 series) #135. |
| Genre | fact |
| Script | Bernard Kashdan |
| Letters | typeset |
| Notes | Statement as of October 23, 1962. Paid circulation averages 141,179, most recent issue is 149,041. |