Crystalline perfection. It is the future of our world. It is the future of all worlds, because I will make it that way. I will purge all worlds of those that try to wipe out our race. Those who try to stop me will be ground underfoot like the insects they are.
-SpaceGodzilla revealing his true motives to Godzilla in "One Last Game"
SpaceGodzilla is the founder and leader of the Earth Conquerors and is Godzilla's genetically cloned brother. He was born from a sample of Godzilla's DNA that was launched into space where it was absorbed by a black hole and mutated into a partially crystalline life form, which then came out of a white hole. Knowing of his origins, he became Godzilla's arch enemy and has repeatedly threatened to conqueror Terra on numerous occasions, but has always been thwarted.
SpaceGodzilla looks similar to Godzilla in many ways, but his skin is navy-blue with a patch of dark reddish-purple skin, that appears much smoother than the rest of his skin, on his abdominal area. The same, he is bulkier in build, as well as being taller. He has two massive white crystals that erupt from his shoulders, and his tail is much longer, ending with several crystal-like spikes. His dorsal plates on his back are made of similar crystals, and are white in color. As a result of him being bulkier, SpaceGodzilla has difficulty walking and he cannot run, but he makes up for this by having the ability to fly through Telekinesis. In addition, his mouth area appears closer to Biollante's, as he has sharp teeth and tusks on the sides of his mouth. He has fire-orange eyes and a trans-orange (fading to trans-yellow) crest on his forehead.
SpaceGodzilla is one of the most intelligent of Godzilla's foes, exhibiting displays of planned combat strategy throughout his appearances. This is further evidenced by the fact SpaceGodzilla sought to dominate the Earth of his own free will, instead of other Kaiju, which only cause random destruction, and only involvement in world domination is to carry out their masters' will.
Due to his overly-muscular body, SpaceGodzilla prefers to attack with his corona beam from a distance, and was at times overwhelmed by Godzilla's assaults in close quarters due to this. His short and stumpy arms make it difficult for him to fight enemies in hand-to-hand combat without using his tail making his actual fighting skills weak.
SpaceGodzilla appears to have an element of true malice to him, as the monster first came to Terra for the purpose of defeating Godzilla; SpaceGodzilla intended to kill Godzilla so that the Earth would be defenseless when he dominated it allowing him to rule. After the Trilopod incident, it is revealed that SpaceGodzilla despises human-kind and see's Kaiju as the true dominant force on the planet and seeks to destroy humanity so that their species can rule the world as the new dominant species. He also likes to refers to Godzilla as "brother" to antagonize him into getting angry, but at times has tried to convince him that humanity is the true evil and that they should work together to destroy them rather than be enemies.
After Godzilla was supposedly killed by the Oxygen Destroyer in 1954, the J.S.D.F. were unable to locate his body, but were able to retrieve a small sample of Godzilla's flesh that survived. Using an experimental probe, they launched the sample into space to test its resilience in the event of further possible monster attacks. At some point, the probe was destroyed by an asteroid and the sample fell into a black hole, where it mutated into a crystalline being before it came out of a white hole. Knowing of his origins through Godzilla's memories, SpaceGodzilla made his way to Terra.
SpaceGodzilla is considered one of the most powerful foes Godzilla has ever faced next to King Ghidorah, Destoroyah, Hedorah, MechaGodzilla and the Trilopods and has at times need help from others to defeat him.
- Corona Beam: SpaceGodzilla can fire a reddish-yellow energy beam from his mouth that he can control as it moves through the air. His shoulder spikes, dorsal plates, and crest usually glow when he powers up and fires it.
- Photon Reactive Shield: SpaceGodzilla can summon a transparent crystal shield that is strong enough to deflect projectiles and even Godzilla's Atomic Breath.
- Tail Smash: SpaceGodzilla's tail is somewhat prehensile, and can lift heavy objects after stabbing them with the crystals on its tip. He can also swing his tail into his foes and knock them off their feet using the prehensile.
Crystal formations: SpaceGodzilla can increase his power by being near gigantic crystals that he creates. He did this during his very first battle with Godzilla by using a massive crystal tower to increase his power, but when it was destroyed, he became considerably weaker and was taken down with only one blast from Godzilla's Atomic Breath. He's also able to unleash bolts of energy from his shoulder crystals.
- Geokinesis: As SpaceGodzilla can create the crystals, he can also manipulate them in battle such as encasing Gigan in a crystal ball and summoning them from the ground. He can also create different objects made up of crystals such as crystal spear when he freed Titanosaurus.
Flight: SpaceGodzilla can fly by means of encasing himself in crystals. On Earth, he is also shown being able to levitate himself and fly around in an upright posture.
Telekinesis: SpaceGodzilla has telekinesis which he can use to move and levitate objects. He has even been able to use this ability to telepathically lift other Kaiju off of the ground and even hurl them around.
Immense Durability: Being a product of Godzilla's DNA, SpaceGodzilla has super regenerative powers on par with Godzilla. He is also one of the few Kaiju that is somewhat resilient to Godzilla's Atomic Breath unless he is severely weakened.