Abnormal Hedorah is a version of Hedorah of unknown origin.
Abnormal Hedorah is mainly comprised of a combination various acids, and does not have a standard form. Hedorah is constantly changing in stature and form, and often times is just a blob of acid. The only parts of him that are solid are his eyes and various tubes jutting out of him. Hedorah is immune to physical attacks, and severely burns and corrodes things that come in contact with him. He is extremely weak to electric attacks. He can morph his body into a giant hand, causing damage to anything he touches. When he needs to, his body will start to spread and spin rapidly, and the tubes will spit gaseous substances, propelling him into the air. He can also shoot acid from anywhere on his body at will.
Hedorah first appeared during the attack on Infant Island, being released from the Switchblade warship, and proceeded to attack Mothra.
During the Final Battle, Hedorah took on Yuki Certasancti and Female Final Godzilla. He managed to burn both of them, but he was dried out and blown to bits. His eye and bits of his body fell into the water, reducing him to a small tadpole like creature, and swam away.