In addition to having greatly increased musculature, a more bestial face with tusks, a longer tail, and a piercing, high pitched roar (a slowed down and higher-pitched version of Gigan's roar), SpaceGodzilla bears several features that are a result of the merger of Godzilla's genes with a crystalline organism in outer space.

[2] Other early designs for the proposed "Astrogodzilla" included it being an albino Godzilla with expansive wings, two tails, and the ability to fire an ice ray.

[2] Special effects artist Koichi Kawakita decided to incorporate crystals onto the SpaceGodzilla design, and added a prominent horn on the creature's head in order to hint at its power and imply it had radar abilities.

[4] In its debut film, SpaceGodzilla's origins are left ambiguous, but it is theorized that it was born through Godzilla's cells (transported into space either by Mothra or Biollante's spores) being exposed to the radiation of a black hole.

The Japan Self-Defense Force's mecha M.O.G.U.E.R.A (Mobile Operations G-Force Universal Expert Robot: Aero-type) was deployed to attack it, but was ultimately defeated.

Land M.O.G.U.E.R.A went for the foundation of his fortress as Godzilla razed the Fukuoka Tower, knowing it was the source of his cosmic clone's power.

However, he was defeated in this form again by Godzilla after the Monster King destroyed his left shoulder crystal, and forced to retreat back to outer space.

In Godziban, SpaceGodzilla-kun is a doppelganger to Godzilla-kun that travels to Earth alongside his brothers SpaceMinilla and SpaceLittle, battling Gabara and Gigan upon their arrival.

DVD Cult said, "The monster SpaceGodzilla is excellently designed, and is certainly far more menacing than anything Dean Devlin and Roland Emmerich ever dreamed up.

"[6] Toho Kingdom praised his theme music, and said "SpaceGodzilla has a nice, hectic, theme that suits him and works well when used throughout the movie,"[7] while Complex listed the character as number 11 on its "The 15 Most Badass Kaiju Monsters of All Time" list, calling him "probably the most powerful thing Godzilla has ever faced".