The Matter Master

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, Showcase Presents Hawkman Vol. 1
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, Showcase Presents The Justice League of America Vol. 2
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 Showcase Presents: Secret Society of Super-Villains #1
DC Comics Presents #26 vs. Sargon the Sorcerer
World's Finest #274-275 vs. Hawkman

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