Ewoks or Jawas, in brief

• Saucer contents, in brief?
• "The War of the Worlds" villains, for short
• UFO pilots, ostensibly
• "The X-Files" characters, for short
• Otherworldly visitors, briefly
• Alf and Mork, briefly
• Little aliens?
• Org. that produces college entrance exams
• Non-earthlings (Abbr.)

Wikipedia Word definitions in Wikipedia
ETS is an abbreviation of: