Dr. Stone S4 - Episode 4

In Episode 4, the Kingdom of Science discovers that another scientist on the other side of the world has been independently revived—and this rival already possesses advanced military technology. While Senku emphasizes that scientific knowledge should be shared globally, the team is suddenly confronted by an enemy aircraft. To neutralize the immediate threat, they deploy acetylene gas as a countermeasure, causing the enemy plane's engine to stall. This leads to the recovery of a damaged aircraft.

The examination of the aircraft reveals further enemy infrastructure, including a cornfield runway, tractors, and livestock breeding facilities. These clues lead the team to the enemy base, where they encounter Dr. Xeno—a professional scientist working for the opposing side. Through strategic encounters with Dr. Xeno and internal discussions within the team, the foundation for an escalating conflict is laid, as the Kingdom of Science prepares to face this new, formidable adversary.