Carlos has a pretty neat science project. So does mean old Jaws. And Arnold is pretty frustrated that he has misseed the deadline to enter the science fair. The next morning, when the science projects turn up sabotaged, there are plenty of suspects. But there's more to this than a school science fair gone bad. A couple of government investigators are also interested in what's going on. Working on their own, Carlos, Reynaldo, Lisa and Rubik discover a rogue robot, much too advanced to be some kid's project. The governement agents soon catch up with them and warn them to stay out of the investigation. But of course Rubik and the kids must know whodunit.