Chronological order: Predator (1987) Predator 2 (1990) Alien vs Predator (2004) Alien vs Predator Requiem (2007) The Predator (2018) Predators (2010) Optional: Blade Runner (1982) Optional: Soldier (1998) Optional: Blade Runner 2049 (2017) Prometheus (2008) Alien Covenant (2017) Alien (1979) Aliens (1986) Alien 3 (1992) Alien Resurrection (1997) Optional: Firefly (2002 to 2003) and Serenity (2005) Source: https://www.imdb.com/list/ls089731876/
A spacecraft flies near Earth and releases an object which enters the atmosphere. Some time later, in a Central American jungle, U.S. Army Special Forces Major Alan “Dutch” Schaefer and his elite military rescue team — Mac, Billy, Blain, Poncho, and Hawkins — are tasked by their commander with rescuing an official held hostage by insurgents. Central Intelligence Agency agent Dillon, a former commando and an old friend of Dutch, is assigned to supervise the team, despite Dutch's objections.
In 1997, Los Angeles is suffering from both a heat wave and a turf war between heavily armed Medellín Cartel and Jamaican posse. A Predator (alien) watches a shootout between the police, Jamaicans and Colombians, observing as Lieutenant Michael R. Harrigan charges into the firefight to rescue two wounded officers and drive the Colombians back into their hideout.
During an archaeological expedition on Bouvetøya Island in Antarctica, a team of archaeologists and other scientists find themselves caught up in a battle between the two legends. Soon, the team realize that only one species can win.
A Predator ship leaves Earth carrying Alien facehuggers, and the dead body of Scar, the Predator that helped Lex defeat the Xenomorph Queen. A chestburster with traits of both species erupts from Scar's body. It quickly matures into an adult Alien and starts killing the Predators on board. A Predator's weapon punctures the hull and the ship crashes in the forest outside of Gunnison, Colorado, killing all but one of the Predators, who's severely injured.
When a young boy accidentally triggers the universe's most lethal hunters' return to Earth, only a ragtag crew of ex-soldiers and a disgruntled scientist can prevent the end of the human race.
In this new chapter, a group of cold-blooded killers are brought together on an alien planet to be hunted by a new breed of alien Predators.
Former blade runner Rick Deckard is reluctantly forced back into service for one last assignment: eliminate four escaped Replicants from the colonies who have returned to Earth to find their creator.
Set three years after the events of ''Blade Runner'', the Tyrell Corporation has developed the new Nexus-8 line of replicants, who now possess natural, open-ended lifespans equivalent to that of a regular human. This causes a massive backlash among the human populace, who begin hunting down and killing replicants, seeing them as a, now very credible, threat to humanity. One of these replicants, Trixie, is attacked by a group of thugs but is rescued by Iggy, who effortlessly disarms and kills the thugs. Iggy reveals to her that he used to be a soldier on a planet called Calantha, but deserted when he realized the enemy soldiers he had been fighting and killing were also replicants.
Niander Wallace is called to a hearing about his desire to manufacture a new generation of replicants. Wallace is warned that what he is doing is illegal and not open to debate, which Wallace questions saying they are debating it. Wallace points out that Earth's ecosystem is collapsing and the only thing that will be able to sustain the human race is cheap labor provided by replicants. He also claims the new replicants are not dangerous to humans, but the lawmakers remain unconvinced. To prove this, he orders his replicant assistant, a newly developed Replicant, to purposely cut himself and then decide between Wallace's life and his own. The replicant then cuts his own throat, shocking the lawmakers. Wallace once again asks them if they are willing to authorize the production of new replicants.
A soldier trained from birth is deemed obsolete and dumped on a waste planet where he is reluctantly taken in by a community of defenseless, stranded wayfarers.
In Los Angeles, in 2048, Sapper Morton is shown weeping hysterically into a mirror. He washes his face in a sink and puts on his glasses. Walking through a crowded street, he is briefly accosted by a group of thugs who he ignores. Greeted by Ella, he gives her the book ''The Power and the Glory'' to read, a book that he enjoyed. Leaving, Sapper goes to a market to sell leeches he has collected, being paid $3,000, which is $1,000 less than Sapper needs. After leaving the market, Sapper sees Ella and her Mother about to be sexually assaulted by the group of thugs he had earlier ignored. Angered, Sapper proceeds to savagely beat the group with seemingly superhuman strength and resilience, inadvertently killing most of them. Sapper leaves the scene, having dropped his identification papers. A spectator, having watched Sapper earlier, calls the LAPD to inform them that he thinks he's found a rogue "Replicant".
In 2049, 30 years after the disappearance of Rick Deckard, a new blade runner discovers a well-hidden secret and must go on a quest to find Rick in order to preserve the future of humanity and replicants.
Following clues to the origin of mankind, a team finds a structure on a distant moon, but they soon realize they are not alone.
The crew of a colony ship, bound for a remote planet, discover an uncharted paradise with a threat beyond their imagination, and must attempt a harrowing escape.
When the seven-person crew of the spaceship ship "Nostromo" awakens midway through their cryo-sleep and journey home, they stop to investigate a distress call from an alien vessel only to be attacked by a mysterious life form whose lifecycle has only just begun.
Ellen Ripley is rescued by a deep salvage team after being in hypersleep for 57 years. The moon that the Nostromo visited has been colonized, but contact is lost. This time, colonial marines have impressive firepower, but will that be enough?
After her last encounter, Ellen Ripley crash-lands on Fiorina 161, a maximum security prison. When a series of strange and deadly events occur shortly after her arrival, Ripley realizes that she has brought along an unwelcome visitor.
In 2379, military scientists on the space vessel USM ''Auriga'' create a cloning of Ellen Ripley, designated Ripley 8, using DNA from blood samples taken before her death. The Alien queen's DNA has been mixed in with Ripley's, so the clone grows up with an embryo inside it. The scientists extract the embryo, raise it, and collect its eggs while keeping Ripley 8 alive for further study. As a result of the xenomorphs' DNA inside her, the clone has enhanced strength and reflexes, somewhat acidic blood, and a psychic link with the xenomorphs. Additionally, the xenomorph's genetic memory allows the clone to have some of Ripley's memories.
In the far-distant future, Captain Malcolm "Mal" Reynolds is a renegade former brown-coat sergeant, now turned smuggler & rogue, who is the commander of a small spacecraft, with a loyal hand-picked crew made up of the first mate, Zoe Warren; the pilot Hoban "Wash" Washburn; the gung-ho grunt Jayne Cobb; the engineer Kaylee Frye; the fugitives Dr. Simon Tam and his psychic sister River. Together, they travel the far reaches of space in search of food, money, and anything to live on.
The crew of the ship Serenity try to evade an assassin sent to recapture one of their members who is telepathic.