Rex Rogan was the CEO of a failing corporation known as Repli-Tech Industries. When he discovered that Repli-Tech was going bankrupt, he initiated a radical tactic that he promised would provide his company's board of directors and he with ultimate power. Relying upon the services of his top scientific mind, Doctor Lovecraft, the board members underwent an experiment in DNA manipulation that transformed them into human-animal hybrids. The process gave Rogan great power, but at the expense of his sanity.

Calling himself Maximus Rex, Rogan established the Arena, a private stadium, the function of which, was to provide gladiatiorial games for the elite and super-rich. The Arena proved extremely popular and patrons were able to satisfy their blood-lust by watching Rogan's Ani-Men slaughter captured prisoners for sport.

Rogan's loyal assistant and lover, Irena, could no longer stomach Rogan's actions. She turned to the aid of the Justice League of America and implored them to stop Rogan's Ani-Men. Some of the League members were reluctant to trust Irena (now calling herself Reena), and felt that she was as culpable in the slaughter of innocent civilians as Rex.

The League fought against Maximus Rex and the Ani-Men, but were soundly defeated. Elongated Man and the Flash suffered severe injuries although they recuperated quickly.

With the location of the Arena compromised, Rex relocated his Ani-Men to a private island off the coast of Newfoundland. The League fought against them a second time, and during this fight, they discovered that the process that transformed Rex and the others into the Ani-Men was having an adverse effect. The process was evolving them into true beasts. Before long, they lost all of their humanity and became true animals. The League determined that they no longer posed a threat and left them on the island.


  • This version of Rex Rogan (Earth-One), including all history and corresponding appearances, was erased from existence following the collapse of the original Multiverse in the 1985–86 Crisis on Infinite Earths limited series. Even though versions of the character may have since appeared, this information does not apply to those versions.



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This character is or was primarily an enemy of the Justice League, in any of its various incarnations. This template will categorize articles that include it into the category "Justice League Villains."

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