The Banki Clan Gaiark are the main antagonist faction of Engine Sentai Go-onger. They are a group of machine beings who travel the Brain Worlds polluting them to make them suitable for their kind.
Traveling to the Human World, the three Pollution Ministers established Hellgailles Palace on an island in the middle of the sea and began working to pollute the Earth to make it suitable for them. However, they faced resistance from the Go-ongers.
After the defeat of Yogoshimacritein and his forces, the remaining Gaiark fled to the Gunman World where their leader Pollution President Batcheed. They later formed an alliance with the Gedoshu to pollute the planet.
- Pollution President Batcheed
- Pollution President Babatcheed
- Barbaric Machine Soldiers Ugatz
- Barbaric Machine Beasts
- Savage Air Pollution Barbaric Machine Beasts
- Savage Water Pollution Barbaric Machine Beasts
- Savage Earth Pollution Barbaric Machine Beasts
Space Empire Zangyack
Black Cross Army