Related Clues:

• U.F.O. pilot
• 'The X-Files' extra
• Extrater-restrial
• 1950s sci-fi villain
• Out-of-focus image, say
• Mass
• It's out of this world
• Oozy gunk
• Visitor to Earth
• Hallowe'en extraterrestrial
• Shapeless movie monster
• Feature of many sci-fi films
• Martian, e.g.
• UFO crewman
• 1958 McQueen foe, with "the"