"The transformation of humans into monsters or animals is a standard feature of two great genres: classical Greek and Roman myth and American comic books. As those of us know who spent our childhoods and teenaged years greedily hoarding the latter, such transformations are only occasionally effected by a mere change of costume. Batman, for instance (introduced in 1939), is an ordinary Homo sapiens who simply dons his bat-like hood and cape when he wants to battle evildoers; his extraordinary powers are the fruit of disciplined intellectual and physical training. More often—and more excitingly—the metamorphoses occur at the genetic level. The Incredible Hulk, who debuted in 1962, is a hypertrophied Hercules-like giant, the Mr. Hyde aspect of an otherwise mild-mannered scientist named Bruce Banner, created during a laboratory accident involving gamma rays. Wolverine, one of the X-men, who sports lupine traits following his transformations, belongs to a despised race of “mutants” with remarkable powers. (The comic book series, now reincarnated as a hugely popular film franchise, debuted in 1963.)" Read more at The New York Review of Books.