With the WarStar defeated, the Goseiger think their job is done. However, the "Erurei no Kou" (Erurei Box) is opened, and the Yuumajyuu, cryptid beings, are set forth upon the world. The Goseiger's new mission is to defend the world from Yuumajyuu forces.
voiced by: Konishi Katsuyuki
A mysterious soldier who doesn't even exist in the records of GoseiKai. His true form is that of the Groundion Headder. 10,000 years ago, he had fought for the Earth against the Yuumajyu. According to the Goseiger of that time, as a result of giving his power to the Earth, he was granted a "Super Evolution" and became GoseiKnight. He is the "Chikyuu wo Kiyomeru Sukuun no Kishi" (The Knight of Fate who will purify the Earth.)
By using the Knightick/"Naitick Power" (literally, the Power of Nothing/Nai) he is able to utilize all 3 Tribe's elements (Skyick, Landick and Seaick), and manipulate their TensouJutsu. He uses his LeonCellular to activate his GoseiCards, in place of a Tensouder. GoseiKnight has sworn to destroy anything that pollutes the Earth, and as such, when he first appears, he goes after a factory whose waste fluid is not being properly treated. This puts him at slight odds with the Goseiger.
A cell phone like device that acts as GoseiKnight's GoseiPower Transfer device, like the Goseiger's Tensouder.
GoseiKnight's personal weapon. It can transform from Gun Mode, to Sword mode, becoming the Leon Laser Sword. By combining the Leon Cellular and the VULCAN HEADDER with the Leon Laser, Knight transforms the gun into the "DYNAMIC LEON LASER". In this mode, it can fire Knight's finishng move, the Knight Dynamic.
When Knight transforms back into the Groundion Headder, he is able to turn into his own GoseiMachine, the GoseiGroundion. Groundion is of the Landic Tribe's powers.
Two Gosei Machines, Gosei Skyon, and Gosei Sealeon (of Skick and Seaick denomination, respectively), that can be summoned by Knight to help him in batte.
The combined form of Groundion, Skyon, and Sealeon when they perform Tensou Gattai. His Victory Charge is the "Groun Drastic".
CHIKYUU GIGOKU SHUUDAN YUUMAJYUU:
Literally, the "Earth Condemnation Group" Yuumajyuu. A villainous group that was sealed away by an Ancient team of Goseiger in the past. Their apearence is that of Cryptids/UMA/Yuma (Unidentifed Mysterious Animals))
BLOB NO MAKUIN:
Voiced by: Chafuurin
Leader of the Yuumajyuu. His plan is to cover the earth with poison, so cryptids like himself can live on the Earth with no trouble. He can peform a mysterious technique using his cane. His name comes from, "Makkuiin no Zettai no Kiki", the Japanese title for "The Blob."
BIGFOOT NO KINGUGON:
Voiced by: Takaguchi Kousuke
An executive of the Yuumajyuu from the Warrior Clan, who is known for power. Can attack with an iron bo, which causes a lot of damage. His name comes from Bigfoot, and King Kong.
CHUPACABRA NO BUREDORAN:
Voiced by: Nobuo Tobita
Formerly Buredoran of the WarStar. Apparently, his true form was of a Yuumajyuu, and is actually from Earth. However, he had sworn allegiance to the WarStar. Now he's returned to the fold. His name change is thus; the Bu in his name is now spelt in Kanji, and means "Warrior". His motif is of a Chupacabra.