Related Clues:

• Genesis sang about an "Illegal" one
• Kind of "Resident," to Spacehog
• James Cameron's sci-fi franchise
• Fictional creature from Mars
• Mork, for one
• E.T. was one
• Sci-fi visitor from another planet
• What Katy Perry plays in the music video for her song 'E.T.'
• Space cadet?
• From far away (perhaps very far)
• One not from around here
• 'Little green man'
• Foreign article contains porky
• Figure in many a sci-fi film
• From Neptune