To prepare for the inevitable Natarl invasion, FFE Fighter bases were establishes globally and Atomic Heat Cannons were planted to guard them. The Mother Ship and its escort of UFOs soon approached Tokyo, prompting one of the remaining FFE Fighters to begin attacking them. In order to assist the optimistic fighter pilot, the Atomic Heat Cannons were fired and managed to destroy the Mother Ship, ending the Natarls' invasion on Earth once and for all.
- The Atomic Heat Cannon, as its name entails, is a cannon which fires rays of atomic heat
- A very similar weapon, the Atomic Heat Ray Gun, appeared in the film Mothra. The only main difference between the two is that the Atomic Heat Cannons are larger and can not move.