Sex/Nudity: We see some of the male crewmembers in their boxers when they're awakened from a deep space sleep.
Parker makes some innuendo toward Lambert when he says that he'd rather be eating something else right now (referring to her) but that right now he's going to eat some food.
We see small photos of bare-breasted women adorning a wall in the spaceship.
We see Ripley in a short and tight tank-top and some very small panties and see the top of her butt as she bends over (as she prepares to go into deep space sleep). 3.5/10.
Violence: A creature suddenly jumps on a person's spacesuit helmet face-plate and then has its "fingers" around his head and its tale-like appendage wrapped around his neck.
Lambert slaps Ripley, and the two struggle and must then be separated.
Ash cuts into one of the alien's "fingers" that's on Kane's face. Acid then pours out and burns through the floor and subsequent floors below that (the crew races to see where it's going and when/if it will stop before it gets to the hull).
An alien bursts from a man's chest (with bloody results), killing him.
We see the now large alien rear up behind a crewmember who doesn't see it (a nearby cat does and reacts). The creature jabs out with its inner set of retractable jaws and lifts the man from the floor. Blood from that man then falls down onto another man.
An alien attacks a man (we don't see the impact).
Ripley grabs Ash and pushes him back against a wall.
Ash rips out some of Ripley's hair, throws her into some equipment and then throws her into another room. He then rolls up some papers, sticks them in her mouth and attempts to smother her with them.
A man grabs another man, but the second grabs the first's chest, causing him pain. The first then uses something to bash the second on the head, causing him to convulse. He then hits his head again, nearly decapitating the second man who turns out to be an android. All sorts of whitish liquid spews forth from the severe neck wound. The body then grabs the first man until another crewmember zaps it with an electric prod.
A crewmember torches an android's head with a flamethrower.
The alien kills a crewmember (with its retractable set of inner jaws that jab out at him). We then see a tentacle like appendage go around a woman's leg and hear her screams, but don't see what happens to her.
Ripley torches two crewmembers (who are alive but look rather bad) that she finds stuck in the alien's nest (they plead for her to kill them and she complies).
Ripley bashes some equipment out of fear and frustration.
A massive explosion destroys a ship.
Ripley opens a hatch to send the alien off into space, but it grabs the opening. She then shoots it with a spear gun and then fires the ship's rockets to blast it before it hurtles off into space. 8/10.
Blood/Gore: Ash cuts into one of the alien's "fingers" that's on Kane's face. Acid (its blood) then pours out and burns through the floor and subsequent floors below that.
We see the gooey underside of the alien creature (it might be gross-looking to some viewers).
Blood suddenly squirts out from a man's covered chest. Everyone pauses in shock and then more blood squirts out as a small alien creature erupts from his chest (covered in blood, while the wall has blood splatter on it).
Blood from a recently killed man falls down onto another man.
Ripley has a little bit of a bloody nose and Ash has some white, blood-like liquid down his head.
A man nearly decapitates a second man who turns out to be an android. All sorts of whitish liquid spews forth from the severe neck wound. We then see the android's severed head from which more white goo oozes forth, while other parts look half mechanical, half organic (with gory results from the opened skin).
We see a brief shot of some bloody, dead bodies. 8.5/10.
Profanity: At least 5 "f" words, 8 "s" words, 18 hells, 6 damns, 5 S.O.B.'s, 3 bitches, 2 craps, 1 ass, and 11 uses of "G-damn," 4 of "Oh God," 2 each of "God" and "Oh my God" and 1 use each of "For Christ's sakes," "For God's sakes," "Good God," "Jesus," "Jesus Christ," "My God" and "Oh Jesus" as exclamations. 6/10.
Smoking: Brett smokes at least 5 times (and rolls his own cigarettes), while Kane and Parker each smoke several times. 4/10.
Alien is one of Ridley Scott's best films, and is definitely recommended to science fiction horror fans. I give it an 8/10.