U.F.O. pilots

• UFO flyers
• "The X-Files" figures, briefly
• U.F.O. fliers
• Creatures that take up space, briefly?
• Roswell crash victims, some believe
• "Roswell" regulars, briefly
• "Independence Day" attackers
• Visitors from another planet, in brief
• "Men in Black" concerns, briefly

Wikipedia Word definitions in Wikipedia
ETS is an abbreviation of: