(Image credit: Columbia Pictures)

What started off as a sci-fi horror turned into one of the best sci-fi comedies ever when it dropped 25 years ago. Being true to its title, Ivan Reitman's "Evolution" proves that nothing ever stays the same – including story.In 2001, the film landscape didn't exactly reward fans who liked funny sci-fi. "Ghostbusters" felt like a fever dream from the long-gone '80s, while "Men in Black II" was still a year away from sliding into theatres and making your neck work.It was one or the other here; you either watched Steven Spielberg's stellar "A.I. Artificial Intelligence" for sci-fi, or Tom Green's gross-out "Freddy Got Fingered" for comedy. That is until "Evolution" fused the two genres and demonstrated that it's all chemistry, baby!

(Image credit: Columbia Pictures)The story begins with a meteor crashing in the desert of Glen Canyon, Arizona. Poor wannabe firefighter Wayne Grey (played by the Stifmeister himself, Seann William Scott) witnesses it as the giant rock wrecks his car, so he calls in the authorities.Community college professors Ira Kane (David Duchovny) and Harry Block (Orlando Jones) head over to the site and spot a trace of liquid near the meteor, so they take back a sample to the lab to monitor and analyse.What they discover is that there are alien microorganisms splitting and evolving at a rapid pace in Earth's atmosphere. Nobel Prize incoming – well, at least in Harry's mind.