Related Clues:

• Space aliens, for short
• Sci-fi beings
• The 'gods' in 'Chariots of the Gods?,' in brief
• One line at passport control
• Roswell, N.M. visitors?
• They're out of this world
• Many "Star Trek" characters
• Alf and Mork, briefly
• Some sci-fi creatures
• To us, they're worlds apart
• The invaders in 'The Invaders'
• Ufologist's concern
• Klingons and Vulcans
• Otherworldly ones, for short
• Saturn drivers?