Astro Boy (2003) Episode 43 English Dubbed Episode Title:Undercover.Episode Description:Klaus, a robot made to look like a human for undercover work, removes the transmitter attached to him and runs away. However, the robot is infected with a virus that automatically renders it incapable of functioning when the transmitter is removed. With the virus vaccine in hand, Atom and Delta pursue Klaus. They learn that Klaus's memory will soon be erased and he is scheduled to be renewed. As he lives as a human, Klaus awakens to human feelings and yearns to be human. It is not known where he is going before he loses his memory. Atom then learns that there is a song that Klaus deeply loved. Klaus had run away to listen to that song. If Atom doesn't find Klaus soon, he won't be able to get the vaccine in time. But Cutter, who is not happy with Klaus, pursues Atom to stop him.