Ep. 21: Yuuko dan Atom menyelidiki Danau Naga terkait pembuangan ilegal dan kerusakan lingkungan.

Yuuko and Atom visit Dragon Lake, a legendary lake where dinosaurs are said to live, to investigate environmental destruction. Yuuko and Sarah, a forest supervisor, go out to investigate and find evidence of illegal dumping, but it turns out that Sarah is the one who is responsible for the illegal dumping to make money. Yuuko is captured by Sarah and her gang because of what she has found out. Meanwhile, Atom goes to the lake to investigate, and meets and becomes friends with Numata, a young man who is chasing dinosaurs in line with the wishes of his missing father. As Atom and Numata wander around in search of dinosaurs, they are met by Sarah's gang, who come to finish them off. A giant robot controlled by Sarah approaches them, but with Yuuko taken hostage, Atom is unable to act. (Source: Wikipedia)
Episode
- Ep. 17 · Robot Terkuat di Bumi / Kebangkitan Pluto
- Ep. 18 · Pluto tetap abadi sementara Acheron jatuh dalam pertarungan akal dan kekuatan
- Ep. 19 · Atom dan Tatsuo menghadapi ledakan roket saat Tatsuo mencoba menyelamatkan ibunya, Erika.
- Ep. 20 · Atom dan Tommy menyelidiki hilangnya anak-anak yang mengunjungi Neverland untuk menghindari penuaan.
- Ep. 21 · Yuuko dan Atom menyelidiki Danau Naga terkait pembuangan ilegal dan kerusakan lingkungan.
- Ep. 22 · Putri Kaya Menyamar Bersama Atom dan Teman-temannya Sebelum Ditangkap oleh Gang
- Ep. 23 · Atom kehilangan ingatan setelah menyelamatkan Bumi dari satelit Ashura yang jatuh
- Ep. 24 · Micro Bears turun ke kota, mengisolasi penduduk dengan ilusi nyaman yang diciptakan oleh Shadow.
- Ep. 25 · Dr. Ochanomizu dan Atom menghadiri peresmian Deep City sambil menghadapi sistem lingkungan yang direkayasa.