- Episode 1: Birth of Atom
2003. An amazing experiment was taking place in the Science City of Metro City. It was the birthplace of a robot with a human brain. Finally, the problematic Atom is born, but other scientists who expect a great robot are disappointed by Atom's behavior like a kindergarten. On the other hand, Atom, who has seen the world outside the lab, is out of his curiosity and runs out.
- Episode 2: Robot Ball Tournament
Metro City's most popular sport, the Robot Ball. Atom enjoys robot balls with new friends. Meanwhile, at the Metropolitan Stadium, where Robotball World Series matches are held, the famous Halle player, who is famous for fair play, suddenly regrets the foul play
- Episode 3: Atom going to space
The mining robots of Planet Deimos suddenly start to act strangely against human orders. Dr. Kojobu is reportedly headed for Damos, and Atom is ordered to keep his house, but eventually he goes after him secretly. The planet, which they arrived in, was confused by a self-propelled mining robot, and Atom rescued people here and explored why the robots revolted.
- Episode 4: Transparent Robot Siel
Eddie, Dong-gu, and Hwang Bo-rae have new friends to Atom who started to go to school. In addition, Atom becomes a friend of Robot Siel, who can make his appearance disappear like an invisible man. But Siel was a thief steered by the villain Skunk. Atom tries to dry up Siegel somehow, but Siegel says he has to steal to get to school