It is the 100th year of Showa (2025, to be exact). Earth sends an expedition to Mars in the spaceship "Izanami". A huge rock formation is discovered beneath the surface, and is transported back to our planet. On the way back, the rock's temparature soars, causing the ship to explode and crash back to earth, leaving a large crater. The seemingly-harmless rock grows into a colossal floating saucerlike crustacean life-form called "Negadon," which proceeds to attack Tokyo. Missiles, tanks, and aircraft all attack but fail to destroy Negadon, whose thick body armor protects it from conventional weaponry. At the same time, Ryûichi Narasaki, a downcast robotics constructor, is still devastated by the death of his only young daughter (and the loss of his left eye, replaced with a bionic eye), caused by the malfunctioning of his masterpiece, the giant super-robot MI-6 2 "Miroku." Because of the ominous threat of Negadon, Narasaki faces the painful choice of reactivating (and piloting) the Miroku to battle the space monster and protect our world from harm.
"Negadon" was released in North America on DVD on July 11, 2006 by Central Park Media.
Tributes to vintage tokusatsu eiga
As a nod to tokusatsu in the mid-Showa era of Japan (1926-1989), Showa continues into the future in this film. Thus, a "retro-style" future.
Outer space is dark blue (rather than black).
The high-tech military and Japan Self-Defense Forces, which has become the staple of many tokusatsu films, from kaiju eiga to space-invader films. The JSDF is equipped with 1960s and 1970s-era weapons and vehicles, which would be anachronistic for 2025 but appropriate for the theme and the era when tokusatsu films first became popular.
The hero/main character, Ryûichi Narasaki, is similar to Dr. Daisuke Serizawa from the 1954 classic, Godzilla, as both scientists are tormented and possess the only weapon capable of destroying the monster (Also, Serizawa has an eyepatch and Narasaki has a bionic eye).
The title monster Negadon is similar to not only Toho's King Ghidorah (which also hatched from a meteorite that fell down to Earth), but also Dogora (which floated over a huge city ripping up objects) and Shochiku's Guilala as well (In Earth's atmosphere, Guilala grew from a spore picked off a radioactive asteroid in far space).
The JSDF usually have "ultimate weapons" such as lasers and vehicles, but as a departure from those conventions, Negadon has a giant robot (the Miroku), similar to the kind seen in "Super Robot" and "Real Robot" anime shows.
Negadon is a radially symmetrical organism, rather like an echinoderm or an armored jellyfish. It has multiple arms, and a turret-like "head" on top.
Negadon flies or rather floats in the air through no visible means of propulsion and can survive in a vacuum. It can fire beams of energy that causes explosions when they hit. When cornered by the Miroku, Negadon opens larger vents in its body that spew forth increasingly-destruction beams of energy.