S1, E2: At the great Institute of Science, where robots are made on huge assembly lines, a giant of a robot - COLOSSO - suffers a short circuit before his electronic brain is completed. In this brainless state, he smashes his way to the street, destroying everything in his path. He will obey the first human being to give him an order. As chance would have it, the first man he encounters is a safe-cracker robbing a bank. Soon Colosso becomes the pawn of a band of notorious criminals. Astro Boy comes to the rescue as the criminals are executing their most sensational theft. He apprehends the criminals and returns Colosso to the Institute, where the huge robot is completed and becomes a “good guy” after all.