Lex provides Scar with his plasma cannon while he makes her a makeshift shield and spear out of the remains of the dead Alien in return of her gratitude.
After the last surviving member of the team, Sebastian De Rosa is killed, they set a bomb in the hive to destroy the temple.
Charles Bishop Weyland (Lance Henriksen), the Weyland Industries chief executive officer, and his team of archaeologists, scientists, and explorers search an ancient pyramid under the ice of Bouvet Island, believed to be the first pyramid ever built due to its structure, combining elements of all the great ancient civilizations.
When the Aliens attack, Weyland refuses to abandon the guns they acquired earlier because he feels that "Too much has been lost to leave with nothing", then, realizing that his illness is slowing them down, chooses to stay behind to try to buy Alexa and Sebastian time to escape.
When Weyland subsequently uses an improvised flamethrower (made out of his inhaler and a flare) against the Predator after it leaves him lying on the ground, Scar retaliates and kills him.
Weyland's right-hand man, Maxwell Stafford (Colin Salmon) was a member of the team sent into the ancient pyramid.
When the pyramid shifts once more, they are chased by Aliens to a cliff, where Alexa just misses the other side and Sebastian is forced to lift her up.
The second female member of the exploration team, Adèle Rosseau (Agathe de La Boulaye) becomes the first victim of a facehugger and the resulting chestburster, after she is put in charge of studying the sacrificial chamber.
After catching her breath, she takes off her jacket and begins to moan and convulse, spitting up blood as the chestburster rips through her chest.
However, upon turning around, he sees another Alien right next to him, and is then taken away, He is next seen Facehugged and cocooned in the sacrificial chamber, he grabs Miller's hand when the latter reached for his gun and can be heard futilely trying to shout for help, indicating that he was still conscious which is an unusual circumstance since facehuggers will usually render their host unconscious.
Quinn is one for the few characters to put up any sort of fight against the Predator, bravely attempting to defend himself from Celtic, however, he is hopelessly outmatched and winds up injured and falls down the tunnel to the pyramid, though he survives this.
Grid (Tom Woodruff Jr.) is an Alien that gets its name from the grid-like scars on its head, which it got from fighting Celtic and being caught in his net and his tail blade was cut off.
Scar (Ian Whyte) is one of three Predators that has arrived at the Pyramid to enact a once in a hundred-year ritual to become "blooded" hunters.
Scar is the only one of the three to achieve blooded status and shows more competency and skill than the other two predators, who both fail to either mind their surroundings and underestimate the Alien threat.
He succeeds in killing several Aliens and manages to survive the pyramid, and aids Lex in defeating the Queen, but is mortally wounded and dies from his injuries.
Dallas Howard (portrayed by Steven Pasquale), an ex-con and the film's one of the two main protagonists, returns to Gunnison, Colorado, after his time in prison.
When Ricky comes home to find Dallas back from his time in prison, he tells him about Dale having attacked him, and that his car keys are lost in the sewer.
In the sewers, they manage to find the keys, but not before Ricky sees a newborn Alien chestburster swimming through the sewage.
After getting through the hospital, losing Jesse and Drew (the two having been killed), and Ricky being impaled, Dallas finds the Predator Wolf's plasma pistol and uses it as his own weapon.
Escape seems almost impossible, until Dallas manages to blow a hole through the wall with the pistol, allowing them to leave safely.
They manage to fly away, but not quite quickly enough; the town's nuclear explosion and fallout creates turbulence, forcing them to crash-land.
After a warning by Sam, Buddy manages to kill one (at nearly point-blank range), which results in his arm being melted off by the acid.
Harry is one of three homeless people living in the sewers; his dog Butch discovers Buddy's arm that had been melted off.
However, an Alien warrior appears, scaring and distracting Harry; this causes him to lose grip of the facehugger, which then clamps on to his face.
While in the sewer, they see the keys at the bottom of a pile of muck and, when they go to retrieve them, they also find an Alien chestburster swimming in the water.
Ricky, enraged, attacks the Predator, before Wolf is jumped on by an Alien, causing them to fall down an elevator shaft.
Kelly O'Brien (portrayed by Reiko Aylesworth) comes home, (after serving her time in the U.S. Army) to her estranged daughter, Molly, and her awaiting husband, Tim.
Kelly convinces the others to avoid Gilliam Circle (i.e. the center of town) and the airlift because she knows the Army will prioritize containing the Aliens over saving lives.
He is unable to overpower the Alien, and is killed, but nevertheless, he manages to save enough time to allow Kelly and Molly to escape.
Jessica "Jesse" Salinger (played by Kristen Hager) was Ricky's love interest and Dale's girlfriend (later ex-girlfriend).