Metal Men #21

From September 1966, this DC issue pits Doc Magnus's robot team against a massive, menacing yellow plastic creature that dominates the cover — its enormous fist scattering the Metal Men in every direction, with one golden figure knocked flat and smaller metallic teammates smashed apart in bursts of energy. The cover banner promises guest shots of Batman and Robin, The Flash, and Wonder Woman in "The Metal Men vs. The Plastic Perils!", making this a genuinely packed installment of the series. Ross Andru and Mike Esposito deliver a wonderfully kinetic cover that captures the team's charm — even in defeat, there's something endearing about these plucky robots taking on a foe that seems to outclass them entirely.