Challengers of the Unknown #21

The cover of this September 1961 DC adventure says it all: Cosmo, a small alien creature, fires a brilliant green energy beam at a massive, fanged serpentine monster while the purple-suited Challengers scramble to escape its crushing coils — and a determined woman in yellow races into the fray. Bob Brown's cover art bristles with tension, posing the question right there in the cover copy: can even Cosmo's amazing space powers overcome that fantastic creature? "The Weird World That Didn't Exist" promises exactly the kind of imaginative, boundary-pushing sci-fi that made Challengers of the Unknown one of DC's most inventive series of the era.