The story revolves around a monster attack in New York as told from the point of view of a small group of people.

The movie, which is believed to have a relatively modest budget of about $30 million, began shooting in mid-June 2007 in Los Angeles, California. The film was edited to look like it was filmed with one hand-held camera, including jump cuts similar to ones found in home movies. Director Matt Reeves described the presentation, "We wanted this to be as if someone found a Handicam, took out the tape and put it in the player to watch it. What you're watching is a home movie that then turns into something else." Reeves explained that the pedestrians documenting the severed head of the Statue of Liberty with the camera phones was reflective of the contemporary period. "Cloverfield very much speaks to the fear and anxieties of our time, how we live our lives. Constantly documenting things and putting them up on YouTube, sending people videos through e-mail - we felt it was very applicable to the way people feel now," the director said.