Premise: The Metal Men are a group of superheroes that appear in DC Comics. The characters first appeared in "Showcase" #37 and were created by writer Robert Kanigher and penciller Ross Andru. Debuting in the Silver Age of Comic Books, the characters have appeared in comic books and other "DC Comics"-related products such as animated television series, clothing, figurines and trading cards.
Hypothesis: The Metal Men is a group comprised only of men.