Sex/Nudity: A TV host/reporter shows some cleavage.
Sam shows up in the bar wearing a very tight tank top that shows cleavage and draws the attention of Alex.
We see Alex emerge from under the water in a bathtub filled with ice. He sits up, fully nude, but the ice covers his crotch area so nothing explicit is seen.
Samantha shows some cleavage and kisses Alex.
We see various shirtless guys following a soccer match, including Stone.
Samantha suggestively asks Alex if he's "ready for this" while kissing him, showing lots of cleavage, and straddling him on the ground in a tight/revealing top and small/tight shorts (and the camera goes across her body in that). But what she's referring to is him asking her father for her hand in marriage.
Samantha again shows cleavage.
Samantha shows some cleavage. 3.5/10.
Violence: To try to impress Sam (who's disappointed a bar won't serve her a burrito), Alex promises he'll get one. After discovering a nearby convenience store has just closed, he climbs on top and breaks and enters through the roof/ceiling. We see surveillance footage of him falling hard to the floor, and then falling hard again, this time to the top of an aisle case, as he tries to climb back out. As he then runs from police, some nearby cars crash, while the police taser him to the ground.
There's hard contact during a soccer match, including one player violently colliding with another, while Captain Nagata ends up kicking Alex in the face, bloodying that.
We hear the sound of Alex and Captain Nagata fighting behind a closed door. We later see Captain Nagata with a bruise on his face, and both lie to Admiral Shane about what really happened (trying to make it sound like it wasn't a fight so that they don't get into more trouble).
As five alien craft quickly approach Earth, one smashes into a satellite, destroying it. The result alien craft debris then rains down on Hong Kong, smashing various buildings and such (with one building collapsing), causing all sorts of panic. We later hear that something like 25,000 people were killed.
Alex, Cora and another crewmember cautiously approach one of the partially submerged alien crafts on a small inflatable boat equipped with a large gun on the front. Alex slowly walks toward the immense structure, only to be shocked and blown back into the water. That causes several huge, alien crafts to emerge from the water, along with a force field that surrounds them and blocks off much of the other fleet vessels. A fighter jet then races at that, but explodes upon contact with the force field. One alien ship then lets out a sonic (or similar blast) that hits many of the ships, breaking glass and such.
A U.S. ship fires at an alien craft that then fires back. All but one incoming explosive is blown from the sky. The one that lands and embeds into the U.S. ship and then explodes.
From a small inflatable boat, Cora opens fire on one of the alien crafts, and one fires back but misses them.
An alien craft fires many explosives at a U.S. ship and many of the projectiles are destroyed, but one hits and it explodes, blowing people around. Many such explosives are then fired and embed themselves into the same ship that's then completely destroyed by the resultant explosions.
Various large, spinning devices equipped with blades are fired from the alien ships. They land on an airfield and proceed to rip through and destroy many helicopters and kill various personnel. Some machine guns are fired back at them, but to no avail.
More of the spinning devices rip through neighborhoods, smashing cars and such, with one going through a baseball field and stopping just short of a boy. It spares him, but then proceeds to knock out various bridge supports, thus causing part of a freeway to collapse.
Some aliens on foot surprise attack a vehicle carrying some police and/or guards. We later see their dead bodies on the ground.
A loud sound and gush of air accompanies Alex and Captain Nagata removing the helmet off a captured alien. They examine it, and when Alex opens one eyelid, the pupil contracts and the alien springs to life. It grabs Alex by the face (and he sees visions of battles elsewhere, presumably in the past), followed by an adjacent wall being blasted open. Other aliens then rescue that first one and depart.
Thinking aliens are onboard their ship, Alex, Cora and others slowly make their way through it, machine guns at the ready. One person is then grabbed and yanked up through an opening and thrown aside, hard.
Several sailors hear loud sounds behind a closed hatch that's then blasted off its hinges. An armored alien then slowly walks down some steps (bending them) and proceeds to go after some equipment in the ship. Walter then tries to intervene and hits the alien, but is knocked back. He then bashes a metal pipe (or similar) into the alien, including onto its foot. It then throws him aside, followed by Alex blasting the alien with machine gun fire (he's thrown aside) and then Cora doing the same with a machine gun and then handgun (she's also knocked aside). Alex and Cora then separately flee, but with a plan. Alex has the alien chase him up onto the deck, where the alien hits him and holds a sharp weapon, but unknowingly has just stepped in front of a large gun remotely controlled by Cora. She then blasts the alien with that.
We see news footage replays of the Hong Kong debris damage as it occurred, along with some subsequent looting.
Alex's ship blindly fires missiles at an alien craft, but they miss. This then happens again, followed by the aliens shooting back, but those miss as well.
As alien craft quickly approach, Alex and Captain Nagata patiently wait to fire upon them. They do at the right moment and destroy both alien ships.
After Alex and Captain Nagata shoot out its windows with sniper rifles, missiles, torpedoes and heavy machine guns are fired at an alien ship, damaging it. But it fires large spinning devices at the U.S. ship and they proceed to tear their way through it. One chases one sailor, but Cora pulls him to safety. Most everyone jumps off into the water, including Alex and Captain Nagata who jump at the last moment before the ship is torn apart by the devices and the explosions they cause.
A battleship gets into a big gun and explosives battle with a large alien ship. Both are hit and damaged.
As the aliens send up beams to a satellite to signal reinforcements, Samantha purposefully drives a jeep into a device, temporarily knocking it off line. Her foot ends up stuck, as does a machine gun, so Mick gets out to fight the alien. He avoids being hit and lands some punches, one of which knocks off the alien's helmet and some teeth from its mouth. Mostly blinded by the sunlight, it hits his legs and flips him to the ground where it repeatedly tries jabbing him with a sharp weapon, but Cal smashes it with a metal case, thus allowing Mick to control it.
As spinning devices fly through the air toward Alex's ship, fighter jets race overhead and destroy them, the alien ship that fired them, and various satellite dishes and related equipment the aliens were using. 7/10.
Blood/Gore: We see some small holes in Alex's back from where taser contacts had earlier attached to his skin.
Alex has a bloody nose and/or mouth after being kicked in the face by Captain Nagata during a soccer match.
We hear the sound of Alex and Captain Nagata fighting behind a closed door. We later see Captain Nagata with a bruise on his face.
Stone has blood on his face following an explosion onboard his ship.
We see some bloody and partially burned human survivors from the alien attack.
Cora has a bloody lip following an alien hitting her, while Alex has some blood on his head from the same.
We see some dead and slightly bloody cops/guards (from an earlier scene). 5/10.
Profanity: At least 3 incomplete "f" words (2 used with the prefix "mother"), 12 "s" words, 11 hells, 7 asses, 4 damns, 1 S.O.B., and 5 uses of "Oh my God," 4 of "G-damn," 2 uses of "My God," and 1 use each of "Jesus" and "Jesus Christ" as exclamations. 5.5/10.
Alcohol/Drugs: Alex has a beer, and then a shot with his brother in a bar where others drink. 2/10.
Battleship is a decent science fiction film with amazing visual effects. I give it 6/10.