

Instead of being built from several submarines by the Mimy, it was originally a World War II-era battleship that was called the Nissan, which sank in the war before being found and retrofitted by Mimy. In the English dub, its origins are different.

Iron Rocks inspired the underwater battleship Barrack Ship from Ultraman 80.Iron Rocks' concept art shows it was originally meant to have legs.Ultraseven delivered the finishing blow with the Emerium Beam, detonating the craft.

After Alien Mimy taunted Ultraseven, he had his ship use its chains to prevent Ultraseven from moving around, only for the hero break his bonds with the Energy Cartwheel. The explosions awakened Dan, and allowed him to transform. Upon the cease fire Iron Rocks remained stationary for the rest of the day and into the night until the Mimi Seijin called on it to fire on the town once again. However, the Ultra Guard was forced to stop due to analysis indicating that Ironrocks was actually an armed bomb. The situation grew worse when Dan was shot out of the sky with one of the Ultra Guard's fighters, but the assault continued with the other fighter, which blew a hole in Iron Rocks. Iron Rocks returned later that day to inflict catastrophic damage to the community and the Ultra Guard was incapable of damaging it. With the submarines incapable of doing anything, Ironrocks was commanded by the Alien Mimy to surface and scare off the population of a local harbor town. The space ship outmaneuvered both submarines in the rocky coral and used special bubbles to jam communications. The UG was sent in to investigate the matter and launched two new submarines: the TDF HRs 1 and 2.Īfter one of subs escaped a whirlpool, they spotted a Alien Mimy's star-like saucer under the water and began pursuit. It destroyed any ship unfortunate enough to be caught in its line of fire. Created by the Alien Mimy using old submarines, Iron Rocks was a highly armed submarine-battleship hybrid that was kept beneath the ocean.
