But about halfway through the movie falls apart when the main character undergoes a complete transformation that makes no sense, just to drive forward the narrative. To say more would be a spoiler, but I was really enjoying the film up until the falloff into what I will call the predictably ordinary. The science is wonky, as others have mentioned, but the sets and effects were strong and the story, while a bit slow-paced, was at least interesting. Not a terrible movie, but could have been much better with better writing.