পর্ব 4: অ্যাটম কেনিচি, তামাও এবং শিবুগাকির সাথে বন্ধুত্ব করে এবং রহস্যময় রোবট লাইটনিংয়ের সাথে দেখা করে।

4

Atom starts to go to school and makes friends with kids named Kenichi, Tamao, and Shibugaki. By chance, he also becomes friends with a mysterious robot named Lightning, who can disappear. The five of them deepen their friendship by playing with a sailboat. However, Lightning turns out to be a thief controlled by the villainous Skunk Kusai. When Atom and his friends realize this, they try to stop Lightning from doing evil deeds. (Source: Wikipedia)