Created for one sole purpose, #17's mission is to destroy Goku. Constructed from a human base, #17 is not completely mechanical. Initially under the control of Dr. Gero, he breaks free and kills him. Even with his creator destroyed, #17's internal programming still gives him the urge to search for Goku and destroy him. This objective is soon put behind him when he is forced to run for his life from Cell. An adept fighter, #17 makes a reappearance in GT as a villain.