Related Clues:

• Native's opposite
• Being from beyond Earth
• UFO flier
• Venusian, for one
• Martian or Venusian
• Roswell visitor
• Not of this world
• Little green man
• Visitor from space
• Concern of 23-Across
• Saucer flier
• ___ being
• "Star Trek" extra
• Not from here
• Spaceship passenger