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Evolution is a 2001 American comic science fiction film directed by Ivan Reitman. It stars David Duchovny, Orlando Jones, Seann William Scott, Julianne Moore, and Ted Levine. It was released by DreamWorks Pictures in the United States and by Columbia Pictures internationally. The plot of the film follows college professor Ira Kane (Duchovny) and geologist Harry Block (Jones), who investigate a meteorite crash in Arizona. They discover that the meteorite harbors extraterrestrial life, which is evolving very quickly into large, diverse and outlandish creatures.

Evolution was based on a story by Don Jakoby, who originally wrote it as a serious science fiction thriller film, until director Reitman hired David Diamond and David Weissman to re-write much of the script into a comedy which Don liked. Shooting took place from October 19, 2000 to February 7, 2001 in California and Page, Arizona, with an $80 million budget, and the film was released in the United States on June 8, 2001. The film grossed $98.4 million internationally. A short-lived animated series, Alienators: Evolution Continues, loosely based on the film, was broadcast months after the film was released.

A large meteor crashes in the barren Arizona desert late at night and is witnessed by would-be firefighter Wayne Grey (Sean William Scott). The next day, local college science professors Ira Kane (David Duchovny) and Harry Block (Orlando Jones) investigate the crash site, discovering the meteor has landed in a cavern and 'bleeds' a strange blue liquid when scraped. They quickly learn that the meteor harbors extraterrestrial nitrogen-based microorganisms that condense millions of years of evolution within a matter of hours: the next day, the microscopic organisms have evolved into asexual fungi and flatworms that cannot breathe oxygen, and aquatic life the day after that.

The site is soon sealed off by the U.S. Army. Ira and Harry ask General Russell Woodman (Ted Levine) and the clumsy CDC Dr. Allison Reed (Julianne Moore) to aid in their research, but their efforts fail when it is revealed Ira was discharged from the army after a failed experiment of his went terribly wrong. Woodman steals Ira and Harry's research, forcing them to infiltrate the base to get another meteor sample. To their shock and awe, the caverns now harbor an alien rainforest teeming with tropical plant and animal life, including flying insects and carnivorous plantlife. That night, a large reptilian creature fatally mauls the owner of a local country club, and the next day a dog-sized frog-like animal attacks two elderly ladies in their own home. Ira, Harry and Wayne find a valley behind the home filled with suffocating dragon-like creatures, which they theorize cannot yet breathe oxygen and are escaping from the meteor site through the local caverns. However, a newly-born dragon quickly adapts to the earth's oxygen and terrorizes a shopping mall before being gunned down by the trio.

Alien Creatures (Evolution) has not been a contender in any CBUB matches.