Their origin predated the start of the series by 30 million years, fighting against the Ultra-Ancient Giants of Light and even Tiga and his two other companions. Evil Tiga's companion, Guardie, is also an Ultra-Ancient Kaiju, but chooses to side with the mankind and was resurrected from its statue to fight against its possessed master in the present day at the cost of its own life.
The first two monsters awakened in modern times were Golza and Melba, both aiming to destroy the three statues inside Tiga's Pyramid. In episode 35, another one named Galra appeared while Gijera emerged not long after Evil Tiga's demise. Later on, a horde of Zoigers emerged from R'lyeh Island to herald the arrival of Gatanothor.
- Golza, Melba, Galra and Gatanothor shared the porous skin texture on their bodies, especially in the neck. In Golza and Galra's case, this method was used to disguise peepholes for the suit actors.
- In the original script of Golza's Counterattack, the Ultra-Ancient Kaiju were planned to be bio-weapons created by ancient scientists in order for mankind to benefit the help of monsters. After witnessing Fire Golza's rampaging spree, a scientist would be driven by guilt and seek Daigo Madoka's help in defeating the monster.
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