If your going to watch Blue Gender the movie I recommend taking the time to watch the series instead. The movie is little more than the 26 or so episodes compressed into 90 min. Watching the series first there were some changes to the storyline to make it all fit, but you miss out so much on the story that your left scrathing your head. One of the biggest issues I had with it was the lack of development between the two main characters, not going to throw in any spoilers but with the level of development and the lever of dedication I guess you cansay in the end is lacking. They also changed the ending of the series in the movie which I prefered over the movie much more.

In summary watch the series :)