<P> In the novella, the character David Drayton--who is married--has a sexual encounter with Amanda Dumfries, who is also married . Darabont did not want to attempt conveying on screen the protagonist being involved in an extramarital affair . The characters in the film, portrayed by Thomas Jane and Laurie Holden respectively, instead share a more emotional relationship . Jane explained, "We kind of form a little family, sort of surrogate family where my son and I'm a father and she becomes the mother to the son . We become a little unit as we're trying to get through this nightmare together ." Holden compared the nightmare to what refugees experienced at the Louisiana Superdome during Hurricane Katrina . </P> <P> While the origin of the mist in the film is never explained in great detail, Frank Darabont did write an opening scene in a draft dated 5 August 2005, in which the thunderstorm causes a malfunction at the Arrowhead Project's lab that allows the portal to another dimension to stay open too long . The scene was never filmed . </P> <P> In December 2006, Jane finalized negotiations with the studio to join the cast . In January 2007, actors Andre Braugher and Laurie Holden joined Jane for the cast of The Mist . Production began the following February at StageWorks of Louisiana, a sound stage and film production facility in Shreveport, Louisiana . Marcia Gay Harden and Toby Jones joined the cast later in the month . </P> <P> William Sadler, Jeffrey DeMunn, and Brian Libby, each of whom appeared in Darabont's previous Stephen King adaptations The Shawshank Redemption and The Green Mile, were cast in supporting roles . Sadler had previously played Jane's role, David Drayton, in a 1986 audiobook version of The Mist . Darabont wanted to cast King in the supporting role that eventually went to Brian Libby, an offer that King turned down because he did not want to travel to film the part . </P>

Where do the monsters from the mist come from