Kumonga

Kumonga  is a giant spider and the primary antagonist of the film Son of Godzilla. Kumonga appears as an ally of Godzilla in Destroy All Monsters and a minor villain in Godzilla: Final Wars.

Son of Godzilla
Kumonga was awakened by Minya and Godzilla's fight with a Kamacuras. He climbed out of his den and attacked Goro and Saeko, but they escaped. Kumonga then traps the humans in the cave and waits for them outside.

Kumonga later encountered Godzilla's son Minilla and trapped him, as well as a Kamacuras, in webbing. As he fed on the Kamacuras, Godzilla arrived and fought the giant spider. However, Kumonga was able to overpower Godzilla and would've killed him if not for Minilla intervening. Together, Minya and Godzilla defeated and burned Kumonga, though hhe lived.

Destroy All Monsters
Kumonga was taken to Monsterland, where he lived with several other monsters. In 1999, aliens known as the Kilaaks brainwashed Kumonga and the other monsters into attacking major cities around the world in an attempt to take over the Earth. However, the humans were able to break the mind-control. In response, the Kilaaks released King Ghidorah to fight the monsters. Kumonga was able to trap Ghidorah in webbing. After Ghidorah was killed, the monsters were able to live on Monsterland in peace.

Godzilla: Final Wars
Kumonga was brain-washed, along with many other monsters, by the aliens known as the Xiliens. The Xiliens released the monsters over the world. Kumonga was shown destroying a trailer with his sharp arms. The Xiliens transported the monsters away and told the humans that they eradicated the monsters to save the world. When the humans found out their plan, the Xiliens released the monsters around the world again. However, Godzilla arrived to fight them. Kumonga confronted Godzilla at New Guinea and trapped him in webbing, but Godzilla grabbed a string of webbing and spun Kumonga around and released it, sending him flying away. Whether Kumonga survived or not is unknown.