Figures in Astounding Stories, for short

• Classic video game villains, for short
• Spielbergian visitors
• Sci-fi film extras
• Dolls named for a film alien
• Those who are not among us (or are they?)
• Co. that administers the GRE
• Some sci-fi creatures
• "Independence Day" creatures, briefly
• Little green men, for short

Wikipedia Word definitions in Wikipedia
ETS is an abbreviation of: