Astro Boy: Tetsuwan Atom - episode 10 - 07 Jun, 2003

A mysterious object is pulled out of the sea. When Dr. Ochanomizu investigates, he finds that it is a Venus robot that was discarded at the bottom of the ocean 20 years ago without being used. Atom discovers that the Venusian robots, who have forgotten what they were created for, are building a city on the ocean floor, waiting for a captain to give them a mission. However, there was one other person who knew about the existence of the Venusian robots—Dr. Tenma. He calls himself the Captain and tries to manipulate the Venusian robots to freeze Metro City with their cooling devices. Following the words of the captain, the Venusian robots head for Metro City, believing it to be for their happiness. Atom and Ochanomizu try to stop them, but in the end, one of the cooling systems is turned on. In an effort to save the people in danger, Atom takes it upon himself to try to rescue everyone at the risk of his own safety. (Source: Wikipedia)