Ep. 18: Pluto remains immortal while Acheron falls in a battle of wits and power
Aired on August 10, 2003

18
Uran is injured while attempting to stop Atom and Pluto from fighting, leaving Atom defenseless. Pluto hesitates to attack due to growing feelings but continues his mission. Tenma kidnaps Dr. Ochanomizu to draw Atom out, leading to a confrontation at Brocken Volcano. The battle begins between Atom and Pluto, who is expected to be stronger but struggles as his emotions weaken his power. Shadow, the creator of Pluto, introduces Dark Pluto, a heartless robot designed to eliminate Atom. Atom is hunted by Dark Pluto and faces a desperate crisis as the conflict escalates.
Episodes
- Ep. 14 · Mini-Atom enters Uran's body to fight a memory-destroying microbot while Dr. Minimini plots to steal Atom's empty shell.
- Ep. 15 · Defend the Artificial Intelligence! / Only a Machine
- Ep. 16 · Robots are abducted by other robots, leading Atom and his squad to an artificial island.
- Ep. 17 · Earth's Strongest Robot / The Rise of Pluto
- Ep. 18 · Pluto remains immortal while Acheron falls in a battle of wits and power
- Ep. 19 · Atom and Tatsuo face a rocket explosion as Tatsuo attempts to rescue his mother Erika.
- Ep. 20 · Atom and Tommy investigate the disappearance of children who visited Neverland to avoid aging.
- Ep. 21 · Yuuko and Atom investigate Dragon Lake for illegal dumping and environmental destruction.
- Ep. 22 · Princess Kaya Disguised by Atom and Friends Before Gang Capture