Answer:

martians

AnswerCrossword Clue
MARTIANS"The War of the Worlds" invaders
MARTIANSLittle green men from the Red Planet
MARTIANSSci-fi staple
MARTIANSHypothetical visitors to earth.
MARTIANSThey're out of this world.
MARTIANS1938 "invaders"
MARTIANSRace from a faraway place
MARTIANSInvaders in an H. G. Wells story
MARTIANSRed planeteers