alien attack
- invasionForcible entry into territory
- UFOUnidentified aerial craft
- extraterrestrialBeing from outer space
- spacecraftVehicle for outer space
- mothershipPrimary vessel carrying others
laser · destruction · abduction · probe · martian · ray gun · Independence Day · panic · military · resistance · saucer · beam · vaporize · War of the Worlds · swarm · tentacles · hostile · sky
origin of threat
alien attackcivil war
Domestic armed conflict
domestic terrorism · nuclear war · internal conflict · military coup · pandemic