How to Say "alien" in Spanish
The most common Spanish word for “alien” is “alienígena” — use this when referring to a creature or being that comes from another planet..
alienígena
Examples
El niño dijo que había visto un alienígena en el bosque.
The boy said he had seen an alien in the forest.
extraterrestre
eks-tra-te-RRES-treh/ekstɾateˈrestɾe/

Examples
Mi hermano dice que vio un extraterrestre cerca del bosque.
My brother says he saw an alien near the forest.
La película trata sobre un grupo de extraterrestres que invaden la Tierra.
The movie is about a group of aliens who invade Earth.
Gender Stays the Same
This noun is special because its ending never changes, regardless of the person's biological gender. You use 'el' (for a male alien) and 'la' (for a female alien), but the word itself is always 'extraterrestre'.
Confusing Noun and Adjective
Mistake: “Usar 'un vida extraterrestre' (mixing up noun and adjective forms).”
Correction: Use 'un extraterrestre' (the being) or 'vida extraterrestre' (the adjective). They look the same but play different roles.
alienígena
Examples
Los científicos investigan la tecnología alienígena recuperada.
Scientists are investigating the recovered alien technology.
extranjera
/eks-trahn-HEH-rah//eks.tɾan.ˈxe.ɾa/

Examples
Me encanta ver cine y películas de cinematografía extranjera.
I love watching foreign cinema and films.
Ella habla una lengua extranjera muy bien.
She speaks a foreign language very well.
Matching the Ending
Because this ends in 'a', it must describe 'feminine' words like 'comida' (food) or 'película' (movie). If you describe a 'masculine' word, you must use 'extranjero' instead.
Using the wrong gender
Mistake: “El idioma extranjera.”
Correction: El idioma extranjero. Even though 'idioma' ends in 'a', it is actually a masculine word, so the description must match it.
Alien vs. Foreign
Related Translations
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