Challengers of the Unknown #20

From the summer of 1961 comes this wild DC adventure featuring "The Cosmic-Powered Creatures!" — and the cover delivers exactly what that title promises. A now-giant Rocky grapples bare-handed against an enormous green monster with snapping jaws and clawed limbs, while his smaller Challengers teammates scramble across the beach below. Bob Brown's pencils and inks give the scene a terrific sense of scale and urgency, with the caption breathlessly explaining Rocky's startling new stature as the team faces down these otherworldly threats.