afraid
alien
apocalypse
attack
businessman
danger
dangerous
difficult
disaster
exploration
extraterrestrial
fear
fearful
flying
frightened
invader
invasion
light
man
martian
mysterious
mystery
mystical
panicked
paranormal
problem
protect
protected
protecting
protection
safe
safety
scared
scarey
secure
security
sheltered
space
spacecraft
spaceship
spotlight
threat
trouble
ufo
unidentified
visitor
worried