Possible Clues:

• UFO personnel
• A story's written about any number of immigrants maybe
• 1986 film starring Sigourney Weaver
• They exist, to Blink-182
• As it's about right, not native
• Foreigners like eating porky new starter
• James Cameron classic
• 'The X-Files' figures
• Space creatures
• Immigrants for instance, maintaining right to take property