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Professor Ivo will inevitably get a listing in the Vile Menagerie. Some might protest, but this is one of those instances where, thanks to the variety of Leagues Martian Manhunter has been involved with, he's uniquely positioned to claim Ivo as a personal foe. This is largely due to Professor Ivo's role in the deaths of several members of the "Detroit" Justice League, a horror which left J'Onn J'Onzz as one of the few surviving members capable of responding to his threat. J'Onzz was one of the first heroes to face Ivo, and among the few to thwart him one-on-one, which we'll explore at a later date.
In the meantime, here's Ivo's first Who's Who biographical page, as a reminder of where the villain had been up to tomorrow's first look at "The End of the Justice League of America." Click image to enlarge. Art by Irv Novick & Rodin Rodriguez.