The phrase "alien mercenaries" is correct and usable in written English.
It can be used in contexts discussing science fiction, military, or security themes involving non-human entities or beings.
Example: "In the latest sci-fi novel, the protagonist teams up with alien mercenaries to fight against an oppressive regime."
Alternatives: "extraterrestrial soldiers" or "foreign mercenaries from another world".
Legions of aliens, mercenaries, Turks, mutants, evil superheroes, Russians, dragons and even a few storm troopers await.
Since President Teodoro Obiang Nguema's government announced that it had foiled a foreign mercenary plot, the radio has been urging Guineans to report suspicious aliens, and the police have been rounding them up and beating them, or worse.
They are soon caught up in the middle of a war between an advanced race of mercenary aliens and a village full of angry Vikings, who don't take kindly to having their gods insulted".
Realizing this will unleash the Aliens on Earth, Ripley, the mercenaries, Wren, a Marine named DiStephano (Raymond Cruz), and surviving Alien host Purvis (Leland Orser), decide to head for the Betty and use it to destroy the Auriga.
(Lionsgate, $59.99, two-disc edition $39.95, R) PREDATORS Adrien Brody leads a group of mercenaries against sport-hunting aliens on a distant planet in another take on the 1987 science fiction thriller "Predator".
The very notion of a relationship that transcends mercenary self-interest may be alien to Icahn.
The film introduces the alien race Sakaaran, who act as Ronan's mercenaries, as a replacement to the Badoon, as the Badoon film rights belonged to 20th Century Fox.
In "Predators," that silly pronouncement by Ernest Hemingway is solemnly repeated by Royce (Adrien Brody), a grim, humorless mercenary who finds himself mysteriously transported to an alien hell.
It may be slightly mercenary on my part, but it doesn't seem alien to friendship to see good in the other and want it for yourself.
