A bloodthirsty alien, devoid of remorse or conscience, kills off crew members of a deep-space mining ship. But Ripley conveys the strong message to never give up and to do eveything you can to try to save your friends and co-workers.
A character sitting down to dinner with fellow crew members falls into convulsions, then dies a bloody death as an alien burrows out of his chest. One by one, characters are killed by the alien. While their deaths aren't always shown, gruesome deaths are strongly implied. Characters shoot a flamethrower and fire a cattle prod while trying to defend themselves against the alien. Horror movie suspense of the "What's that around the corner?" variety abounds.
Toward the end, a character takes off her space uniform, stripping down to a half-shirt and panties. In one of the pods, there are pictures of naked women, breasts shown.
Expletives when faced with alien outbreak: "f--k off," "son of a bitch," "horses--t," "hell."
Early in the film, a character is never shown without a cigarette in his mouth. At a celebratory dinner, a character is shown drinking from a can of beer, but does not act intoxicated.