Mark Mandrill - Discover of the chemical Menthachem, which allows
him to control the very properties of matter.
| Issue | Comment | Reprinted in |
| Brave and the Bold #35 | 1st appearance, vs. Hawkman and Hawkgirl | DC Special #5, Hawkman Archives #2 |
| Justice League of America #28 | With the Top, the Tattooed Man and the Headmaster Mind, vs. the Justice League | Justice League of America Archives #4 |
| Hawkman #9 | vs. Hawkman and Hawkgirl | |
| Justice League of America #116 | vs JLA | |
| DC Super-Stars #10 | on the villains baseball team | DC Blue Ribbon Digest #13 |
| Secret Society of Super-Villains #7 | w/ Felix Faust and the Wizard, vs Hawkgirl and Captain Comet | |
| DC Comics Presents #26 | vs Sargon the Sorcerer | |
| World's Finest #274-275 | vs Hawkman |