Despite the movie's unrelenting violence and dark tone, the characters actually behave in an admirable way; characters from different backgrounds team up to strive toward a common good. They choose hope over despair and order over chaos. They show bravery and selflessness (the hero tries to go back to rescue fallen comrades). They also choose not to inflict violence on an alien child.
Sudden attacks occur throughout, complete with stabbings and slashings with sharp instruments. An eyeball is pierced with a needle, and a character's stomach is sliced open, with guts visible. Blood, muck, and slime are plentiful. Since the story takes place mostly in the dark, in twisted, sinister-looking corridors, and using a terrifying array of screeching sound effects, there's a constant state of tension and dread. Characters engage in several lengthy fights, with grabbing, punching, hitting using blunt instruments, and shots from a "non-lethal" wrist ray gun.
Not much of an issue. The hero appears wearing only underwear in one scene, and the heroine displays ample cleavage throughout, but there's no nudity and no suggestion of sex.
Not a constant barrage of foul language, but many uses of "f--king" and "f--k," as well as "s--t," "hell," "damn," "ass," "oh my God," and "goddamn."
Drinking, Drugs & Smoking
Not really an issue. A sedative is given to a hysterical character against his will, and other characters are rendered unconscious with knockout gas.