it would do infinitely until the country was overtaken by thousands of these gigantic creatures. The team maneuvers their firetruck underneath the mass and discovers a rectal-like orifice to spray the shampoo up-into; moments before the creature splits into two, the team succeeds and the monster explodes. The governor declares Ira, Harry, Wayne and Allison heroes; Wayne is made a fully-credentialed firefighter, and Ira and Allison begin dating. Later, Harry, Ira and Wayne are shown promoting Head & Shoulders for both hair-care and fighting the aliens. Cast Production Development Evolution was based on a story by Don Jakoby, who originally wrote his draft in 1998 as a serious science fiction horror thriller that was described as "humorless and violent" and "The Thing meets The Andromeda Strain", envisioning John Carpenter to helm his idea. Ivan Reitman loved the script but saw potential in the film being successful as a comedy, calling it a "modern-day successor to Ghostbusters" he had always planned to make. Reitman hired writers David Diamond and David Weissman to re-write much of the script and combine it with elements of another screenplay, a comedy written by Todd Phillips and Scot Armstrong about three friends who hunt aliens. Although Jakoby was initially upset about the script's change in tone and atmosphere, Diamond and Wiessman worked closely with him to ensure the final product was something he was happy with. The original script ended with the alien organisms evolving into an ultra-intelligent humanoid species that climaxed with a "battle of wits", but this ending was deemed not exciting enough and was replaced with the climax seen in the final film. Reitman produced the film Beethoven in which Duchovny had a small role, and had him in mind as a leading man who could do comedy. Seann William Scott was cast after starring in Road Trip which Reitman also produced. Duchovny wanted to move away from the character he was known for in the X-Files television series, and thought a comedy about aliens would help him transition to different roles. Filming Shooting took place from October 19, 2000 to February 7, 2001 in Page, Arizona and around the Greater Los Angeles area, particularly in the Santa Clarita, California region. The scenes taking place at the fictional Glen Canyon Community college were filmed at Cal State Fullerton. The shopping mall scenes took place at the Hawthorne Plaza in Hawthorne, California. The first