Warning: Possible spoilers.
Set in 1972, two astronauts (a third is orbiting in the ship) travel to the moon.
Apollo 18 is told from the perspective of being filmed during the actual mission, which it is NOT. I did not care much for this technique.
The first two indications that something is wrong are that they find a dead cosmonaut. and they are mainly communicating with the Department of Defense, more than NASA..
There was plenty of anticipation, and not necessarily in a good way. I found myself constantly waiting for something, anything, to happen. It did, as the two astronauts discover that they are indeed not alone.
Much of the scariness is accomplished through surprise (and through the creatures that attack them) and it was successful, because my nephews, age 13 and 11, told me it is the scariest movie they've ever seen.
Content warnings include scariness and some gore.
An interesting story, but it could have been done better.