Related Clues:

• Extraterrestrial
• Bizarre
• 'V' villain
• Bogeyman
• Out of this world
• Weekly World News cover photo, maybe
• Non-earthling
• Huge
• Otherworldly
• 'Men in Black' menace
• Dinosaur, e.g.
• Completely foreign
• Strange
• One who's out of this world?
• From Mars, say