Very good story line. The characters are very good role models, actually, and learn great lessons. Rex, in one episode, learns to not care about what others think about him and that they didn't appreciate him helping them, and helped them anyway. The EVOs could be scary to younger kids and the basic flirtations of a fifteen year old are also there. Lots of action, comedy, drama, sci-fi; it's pretty awesome. Bobo Haha, the monkey, likes to play poker for money, but it's all fun. No blood, a couple not major injuries, but it can be a little scary when regular humans turn into EVOs, especially when the hero, Rex, absorbs too many nanites and starts to evolve into one, but it's all animated and not too bad. Wonderful show, I recommend it and it has an amazing plot.