Fighting to end the cynicle ways of Shredder, and to avenge for Splinter, their sensei. Donatello and his other turtle mutation brothers have learned great martial arts from Splinter and are ready to set things right. Donatello is undoubtely the genius of the group. He spend most of his time inventing and repairing the electronics needed by the Turtles. If you have seen the Turtle Van you'd understand - it is a Donatello creation. Not only a master in science but in the martial arts of staffing as well. No other can handle a staff or fight with one like Don. Though some see him as a forgotten turtle in the shadows, he is definately not. Withouth him the turtles wouldn't be the turtles.