Related Clues:
- Sci-fi stranger
- UFO pilot
- Unlike 666
- Sigourney Weaver thriller
- Otherworldly visitor
- Green-card holder
- Xenophobe's bugaboo
- Like all but one prime
- Prompting a 'hmm,' perhaps
- Film that happens aboard the Nostromo
- Tabloid photo subject
- Like all prime numbers except 2
- Like 1, 3, 5, 7 ...
- Really strange
- Not of this earth