While many characters embrace the brand-new idea of mutants and humans living together in peace, others can't or won't; there's lots of conflict surrounding the idea of whether mutants should try to "fit in" or embrace their differences. But ultimately the message is that it's important to be yourself, whatever that self may be able to do or happens to look like. Still, some of the mutants feel justified in waging war against normal humans, who are afraid of them. And even the heroes feel like outcasts. Though the good guys are willing to protect non-mutants, there’s still a lively debate about why they should.

Plenty of action, including super-powered combat featuring energy beams, fireballs, whirlwinds, and sonic blasts, as well as super-strength fistfights that send characters flying across the room. A fierce assault pits super villains against normal people, who are easily (and brutally) dispatched. There are major explosions, crashes (plane, submarine, more), gunshots, and several flying blades, and a coin is turned into a lethal weapon, shown in slow-motion close-up as it hits its mark. A boy's mother is killed in front of him, scarring him for life. A man's hand is stabbed through with a knife; people are slashed with knives and swords. Overhanging threat of nuclear war.

Frequent skimpy, Bond Girl-esque outfits and one blue, scaly female mutant who sometimes walks around nude (though it looks as though she's wearing all-over body armor). In one scene, a girl, seemingly naked under the covers, invites a man to join her in bed; other scenes show kissing/groping. One scene includes several women in lingerie who are implied to be call girls/escorts; another is set in what appears to be a strip club, though there's no actual nudity.

One memorable use of "f--k"; other language includes infrequent use of "ass," "hell," "goddamn," "oh my God," and "damn."

Tie-in to vast quantities of related merchandise.

A few scenes show people drinking, both in rowdy bars and in more quiet moments at home -- sometimes to excess. The younger mutants have one somewhat wild party. Occasional smoking (accurate for the 1960s setting).