Related Clues:
- Not terrestrial, perhaps
- Sci-fi film extra
- An American in Paris, e.g.
- Not terrestrial
- Like a Ninja Turtle?
- One of 'them'
- Not natural
- Xenophobe's fear
- With 27-Down, sci-fi phenomena that help explain this puzzle's theme
- Dance performed by The Jackson 5
- Man of steel
- Factory worker
- Border crosser
- Man of steel?
- 1979 sci-fi thriller