Three days after the bombing of Hiroshima, the mystery men are in Kokura, Japan, the intended target of the second atomic bomb. Their purpose is to stop the bombing by obtaining a Japanese surrender. Instead of surrendering, the Japanese army attacks the heroes, resulting in a large-scale battle. The U.S. military, in the mistaken belief that the resulting dust and debris are cloud cover obscuring the city, switch the target city to Nagasaki. Meanwhile, Carter takes advantage of the confusion to trap The Flame within the urn; it was necessary to imprison The Flame first as his power would help the other mystery men survive within the urn.
The Flame is presumed killed, ironically, by the fires of Kokura. The Fighting Yank imprisons Flame Girl after The Flame's memorial service. In the years following World War II, Carter continues to imprison his fellow mystery men, one by one, including the newer heroes which spring up after the war. One of the few heroes to escape this fate is The Green Lama, who returned to Tibet immediately after The Flame's memorial.
Samson flew off from Kokura to intercept the bombing mission. Arriving too late to prevent the bomb’s deployment, Samson is caught in the air burst and the blast literally melts his eyes.
A large number of mysterymen were present for the Battle, including: