Sci-fi staples

• Some toy dolls of the 1980s
• Area 51 creatures, it's said
• "The Outer Limits" extras
• Alf and Mork
• UFO pilots, supposedly: Abbr
• Most of the characters in "The Hitchhiker's Guide to the Galaxy"
• Some CGI creations
• Visitors from beyond
• Mork and Worf

Wikipedia Word definitions in Wikipedia
ETS is an abbreviation of: