Some sci-fi navigators

• "Arrival" visitors
• Possible UFO pilots
• They'll definitely get crazy roaming surchanges if they actually try to phone home!!!!: Abbr
• "V" visitors, briefly
• UFO occupants, perhaps
• Ones out of this world, for short
• UFO's crew
• Some Wells creations
• UFO drivers, ostensibly

Wikipedia Word definitions in Wikipedia
ETS is an abbreviation of: