The term 'Alien Actor' refers to three actors who have appeared in the Alien film franchise. The first is Ian HOLM, a British actor who has been in films such as Chariots of Fire and The Lord of the Rings trilogy. The second is John Hurt, an English actor who has starred in films such as The Elephant Man and Harry Potter and the Deathly Hallows. The third is Sigourney Weaver, an American actress who is best known for her role as Ellen Ripley in the Alien films. All three actors have had long and successful careers in the film industry.