The first attack of UFO!
UFO's invasion of Earth was started.
You are only our hope.
Defend Earth against the attack of UFO
brained and bold as time went on and
the attack of their bosses changed
at every moment.
Unfortunately, your missile cannot
get out of earth gravity.
Sometimes your missile can rescue Earth
from UFO's attack by driving UFO back,
and can threaten you.
Only you can defend Earth against
the UFO's attack.
Put your missile into UFO right now!