When Walker goes walkabout, and stumbles upon footprints, the fun, so to speak, begins. The tracks lead to an abandoned Soviet lunar lander, and a dead cosmonaut. Who knew the Russians made it to the moon? Apparently our Defense Department did.

Cue those listening devices.

Before long things go bump in the night, piercing shrieks are heard – and creepy crawlies are on the march. “Apollo 18” morphs into a monster movie, paying homage to such popular genre classics as 1979’s “Alien.”

It’s no wonder NASA has issued an official press release reminding the public that “Apollo 18” is a work of fiction. The movie is presented with sufficient realism and convincing period detail that it would not look out of place as a “60 Minutes” expose.

The film contains sporadic but intense moments of terror and fleeting profane and crude language. The Catholic News Service classification is A-III – adults. The Motion Picture Association of America rating is PG-13 – parents strongly cautioned. Some material may be inappropriate for children under 13.

McAleer is a guest reviewer for Catholic News Service.