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Related Clues:
- Sci-fi film staples
- "Men in Black" targets
- UFO navigators, so they say
- Many Astounding Stories cover subjects
- Riders in 10-Across
- Margaret Mahy had them in the family
- Immigrants for instance, maintaining right to take property
- 'Guardians of the Galaxy' title characters, informally
- U.F.O. occupants
- Predators in the 'Predator' films, for short
- Time Lords on 'Doctor Who,' e.g
- Flying-saucer crew
- They're not like us
- Subjects of some conspiracy theories
- Some "MIB" characters