Challengers of the Unknown #54
In "War of the Sub-Humans!", the Challengers of the Unknown face a renewed threat as Villo, their long-time adversary, reassembles the Sub-Humans—only to be challenged by the ambitious Bubble-Master, who seeks to prove himself as a worthy ally. Written by F. E. Herron and illustrated with sharp detail by Bob Brown (pencils and inks), this 1967 issue delivers a tense clash of schemes and shifting loyalties, with the cover by Bob Brown capturing the moment of high-stakes confrontation.
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Villo has recalled his latest threat against the Challengers, the Sub-Humans, before they kill his arch-enemies, when he is contacted by Bubble-Master, who wants to prove himself a worthy ally against the Challs. After a test heist, Villo accepts Bubble-Master as his partner, but before long they have a falling out and Bubble-Master leaves Villo to be captured by the Challs. Brainex releases the Sub-Humans again, and while the Challs are distracted, Bubble-Man frees Villo. Prof uses a computer to defeat the Sub-Humans, but the trio of villains remain free to hatch their next plan.
Plot details indexed by the Grand Comics Database (CC BY-SA).