Robogog of the 10-sai

Robogog of the 10-sai was originally a human scientist who perfected a method to of immortality through cybernetics. Though ostracized for his methods prior to converting himself into a cyborg, the Matrintians begged for his help when their city sank into the sea.

Since then, Robogog believes all organic life because of their emotions have no purpose other than to to serve him and his machines by using fear. Though he uses Matroids to do his dirty work, Robogog is not above personally getting involved in fights if it benefits his need to gather data on an opponent.

Story
Robogog uses his creations to gather intel on the Goseigers while adding Buredo-RUN to his ranks to function as his trump card. After getting enough info on his enemies, Robogōg makes his move to finish them off by using Buredo-RUN as a sacrifice to seal the Tensouders and the Leon Cellular. However, the Leon Cellular is still functional as Gosei Knight ruins his scheme to kill the Gosei Angels easily.

After enlarging he tries to use his self-destruct attack to wipe out the Goseigers and possibly all of Japan, but is stopped by Datas Hyper and Gosei Ground before being scrapped by Ultimate Gosei Great. However his head survives, taunting the Gosei Angels that he can easily rebuild himself with his Salvation Cell.

However, Buredo-RUN destroys the item and Robogog realizes Buredo-RUN regained his memories with Metal Alice's help. Confirming his killer's true nature, Robogog's head is thrown into the air and obliterated by Buredo-RUN's missiles.

His spirit later appears to Brajira, futiley trying to attack him before being cast away.