Meganulon (メガヌロン, Meganuron) were Mesozoic giant insects reanimated by mining operations in Kitamatsu village, Kumamoto Prefecture, in the 1956 kaiju film Rodan. (Presumably they are, like the titular daikaiju, from the Cretaceous Period.) The car-sized insects, which resembled overgrown earwigs, slaughtered several men before some were killed in a mine shaft. A mine collapse followed, separating engineer Shigeru from fellow miners and police. Before finding his way out of the mine, Shigeru witnessed the hatching of Rodan, who began to devour the comparatively tiny Meganulon.
The added death toll and still missing whereabouts of Goro prompt suspicion that the missing miner is in fact behind the series of killings. A hunch which is quickly dismissed as one of the Meganulon ventures into a local village to attack a couple, Kio and Shigeru, who flee to get help. Shortly after, the police arrive on the scene and ineffectively try and shot the giant insect down while it bids a hasty retreat back to its lair. The police are quick to pursue, but their weapons pose no threat to the thick carapace of the ravenous insect, whose deadly pincers take the lives of two officers who advance too close. The Meganulon then returns to the mine shaft, killing more innocents along the way.
With the killer finally revealed, and the seriousness of the situation grasped, the self defense force is quickly dispatched to the area to exterminate the threats. Armed with mountable machine guns, a few regiments of soldiers, along with Shigeru, march into the mine to hunt down the creatures. While searching for the Meganulon, Shigeru uncovers Goro's body, which had been dragged deep into the shaft. There is little time for grieving, however, as Meganulon start to emerge to fend off the intruders. The military shells the creature with machine gun fire, but to no avail as the carapace, once again, deflects the bullets. Out of options, Shigeru hitches a ride on a nearby mine cart, driving it down the shaft and directly into one of the Meganulon, killing the beast. With a small victory claimed, Shigeru attempts to retrieve Goro's body, but ends up being trapped as another Meganulon emerges just as a landslide blocks his escape. The large rocks continue to pummel the area, knocking Shigeru out and killing the giant insect.
Eventually, the young miner awakens, as Shigeru opens his eyes only to realize that he is now trapped in the Meganulon's lair. Even with the ravenous insects all around, Shigeru's attention is diverted to another object in the room: a mammoth egg. It's quickly discovered that the Meganulon weren't the only creatures awakened by the atomic tests, as the egg hatches to reveal a gigantic pteranodon called Rodan. The red hued monster flaps its still developing wings, as it spies the killer insects that are situated all around it. The beast wastes no time, and quickly begins to devour the nearby Meganulon, as Shigeru can only stumble backwards at the sickening sight. Once full, the infant monster spreads its wings and takes flight, leaving behind it the remnants of the once horrific insects while Rodan would soon prove a far more deadly adversary to the entire globe.
During the eclipsing hour of the new century, the human race marveled at its newest achievement. Harnessing the untapped and fathomless energy of a black hole, the machine was designated to be the final stand against Godzilla. Dimension Tide would expel a rift in the time and space realm, thereby vacuuming any fortunate creature or objects in its path. While during a testing trail of the weapon, a feedback of a field of instability was left behind. A rare and theoretical scatter hole marked the machines use. Following that night, a winged insect pulled itself from the punctured veil of time, and laid an egg. The ball of tightened skin was found the next day, by a small boy who carried it to Tokyo. But keeping the object a secret from his mother was difficult, so he decided to drop it into the sewer systems.
Deep in the bowels of the city, submerged in the filth-ridden waters, the egg revealed itself to be a cluster of womb, Meganulon. Pulling free from their shelled prisons, the deadly and carnivorous insects grew and thrived. The water being the key element to their newly dubbed life. Shadowing themselves in the darkness of the untouched, the creatures sprang forth in lightening speed and murdered. An unknown number of helpless Japanese victims fell before the great feasting of the swarm. It was not long, though, before the creatures stood ready for their next stage in life. An even greater evil lay silent, waiting for its time to recapture the royalty of the Meganulon colony.
MeganulaGodzilla roared in contempt. As if answering the shrieking cry, the swarm attacked. Encasing the oak sage colored reptile, the bodies of armored hides cloaked his body. Stabbing with their sickle like tails, the relentless Meganula fought. Never before had Godzilla witnessed such a show of force, but he would not go quietly into the night. Lashing out with his whip like tail, grabbing with his clawed fists and obliterating with its heat ray, Godzilla reduced the horde. Diminished horribly by the raging flames that burned within the nuclear monster, the remaining members of the colony pulled away. Their collective conscious told them that sufficient energy was gathered.
Godzilla watched as the survivors of the insect swarm flew way, distancing themselves as much between their godly prey. The monster took off, though would arrive on scene far too late. The military watched, completely puzzled, as the prehistoric creatures dove into the waters that plagued Tokyo. Beneath the dark waters, the animals injected their bioelectric life-force they stole into a pupate larva. A chosen queen that would defend the territory of the hive. After sacrificing their lives, the bodies of the servants drifted to the surface, fulfilling their duty in life. Meanwhile, their lasting act of life empowered a warrior, a killer of giants. The true horror of the past was about to reveal itself to the present.
- The Meganulon is an actual species of giant dragonfly that lived durring the Devonian Period nearly 300 million years ago. Of course, the real Meganulon never reached the size of the monster that appeared in Rodan or Godzilla vs. Megaguirus.