Challengers of the Unknown #51

In "Smash the Sponge Man— Or Die," the Challengers of the Unknown face their strangest foe yet when the enigmatic Sponge Man assaults an undersea base, forcing the Sea Devils to call for help. With Bob Brown’s dynamic art bringing the aquatic showdown to life, the heroes must unravel a mystery tied to a former neighbor, Lisa, and a shadowy plot by Scorpio—before a deadly gas attack turns the tide. Written by Bill Finger and illustrated by Bob Brown, this 1966 classic features a cover by Bob Brown that captures the chaos of the moment.