Wikipedia
SpaceGodzilla is a monster which first appeared in Toho's 1994 film Godzilla vs. SpaceGodzilla, portrayed by suit actor Ryō Haritani. The idea of a "Space Godzilla" was first conceived in 1978, and the character was designed as a homage to the monster's hinted progenitor Biollante by incorporating tusks and a hissing roar reminiscent of the latter monster. Creature designer Shinji Nishikawa had initially envisioned SpaceGodzilla as a much more western dragon-like creature with large fin-like wings on the back. Other early designs for the proposed "AstroGodzilla" included having the character be a quadruped or a much more Biollante-like monster commanding a horde of cosmic dragonflies. The final design bore greater resemblance to Godzilla's final form from the video game Super Godzilla, itself also designed by Nishikawa. Special effects artist Koichi Kawakita decided to incorporate crystals onto the SpaceGodzilla design, and added a prominent horn on the creatures head in order to hint at its power and imply it had radar abilities.
In its debut film, SpaceGodzilla's origins are left ambiguous, but it is theorized that it was born through Godzilla cells (transported into space either by Mothra or Biollante's spores) being exposed to the radiation of a black hole. SpaceGodzilla heads for earth and traps Little Godzilla in a crystalline prison, before landing in Fukuoka and forming a crystal fortress which drains the city of power and transfers it to SpaceGodzilla. It is ultimately stopped through the combined efforts of Godzilla and M.O.G.U.E.R.A..