| Issue | #45 |
| Published | May-June 1959 |
| Cover Price | 0.10 USD |
| Pages | 36 |
| Editing | Julius Schwartz |
| Notes | Cover pencils and inks from Julius Schwartz's editorial records, provided to the GCD by DC Comics (28 January 2008). Non-story sequences added by Ed Boner, March 2009. |
| Genre | animal; adventure |
| Pencils | Gil Kane |
| Inks | Bernard Sachs |
| Notes | Cover pencils and inks from Julius Schwartz's editorial records, provided to the GCD by DC Comics (28 January 2008). Non-story sequences added by Ed Boner, March 2009. |
| Synopsis | Using Professor Rayburn's new formula (see issue #44), Rex travels to the super world of Lamenor and helps o-tar win the hand of Lady Elen. REX QUOTE:"I wonder what would happen if I took that drink?" |
| Genre | animal; adventure |
| Script | John Broome |
| Pencils | Gil Kane |
| Inks | Bernard Sachs |
| Script | Jack Schiff |
| Pencils | Bernard Baily |
| Inks | Bernard Baily |
| Letters | Ira Schnapp |
| Synopsis | Bobo is to be the star witness in the trial of Legs Dunne. BOBO QUOTE:"I saw this trick in a movie once!" |
| Genre | animal; detective |
| Script | John Broome |
| Pencils | Carmine Infantino |
| Inks | Carmine Infantino |
| Letters | typeset |
| Synopsis | Traveling out west with Danny, Rex renews an acquaintance with a bear, finds a lost child, a lost bear cub and captures two escaped convicts |
| Genre | animal; adventure |
| Script | John Broome |
| Pencils | Gil Kane |
| Inks | Bernard Sachs |