Alien Theory is a thoroughly enjoyable and well-crafted film. The cinematography, the editing, the soundtrack... all spot on! The performances are also quite genuine. On my first viewing, I initially thought that some of the acting was over the top, borderline hokey. Once I settled into the film, and particularly on a second viewing, I realized how appropriate the characterizations were for the plot.
There's a Memento-esque quality to the way the plot is propelled forward by use of flashbacks. Just like that film, a lack of memory is critical to the forward momentum of the story. The details are very different, though. This isn't your typical comedy amnesia alien invasion action film!
Review by tomgalli from the Internet Movie Database.