Thousands of years ago, a peaceful alien race
lived on an asteroid between Mars and Jupiter.
They were far more scientifically advanced than
the beings of Earth. When Earth entered the Neolithic
Age, this alien race had discovered the atom bomb.
Despite all this progress, their world was devastated
by terrible weapons when war erupted among their
people. The bodies of those who survived were
mutated and contaminated with Strontium-90, and
following this catastrophe, the survivors moved
to Mars. However, since that planet was such a
wasteland, they had to find a new home that could
fit all of their needs. They desired Earth...
Hiding on the dark side of the moon, these people
planned their invasion for years. Finally, in
the Earth year 1957, they found a place where
they could begin their attack: Japan. The aliens
arrived on Earth undetected, by transporting their
UFOs from their mother ship and hiding underground
in the Mt. Fuji area. A scientist by the name
of Ryoichi Shiraishi however, discovered the race
of extra-terrestrials. Instead of informing the
authorities, he began to collect research on this
remarkable discovery. He called their former home
planet Mysteroid, a combination of the words "mystery"
and "asteroid", and the aliens were
dubbed "Mysterians". He transferred
his reports to Dr. Adachi frequently; however,
the doctor didn't realize that the species actually
One summer night, the Mysterians finally set
their plan into motion. They set a celebrating
village aflame by heating the ground with terrific
amounts of radiation. That same night, Ryoichi
vanished without a trace. The next day, another
village was destroyed when the ground caved in;
everyone was killed. Not even a dog survived.
When local officials investigated, they encountered
something frightening: a huge, burrowing robot
armed with powerful lasers: Moguera. That night,
the monstrous mech attacked another village, where
it was met with resistance. The bridge leading
out of the village was destroyed, ending the robot's
destructive force. Suspicions started to rise
when it was discovered that the substances that
comprised Moguera were not of this Earth.
Meanwhile, Dr. Adachi witnessed the UFOs soaring
from behind the moon through his telescope, giving
further proof that aliens were invading the planet,
and prompting the scientist to announce his discovery.
The following day, investigations were made near
a local lake, when something startling happened.
A dome appeared from beneath the ground, another
sign of the impending invasion. The visitors from
space requested the presence of scientists, so
the two races could work out a peace treaty. The
aliens revealed their past, and informed the Earthlings
that they were indeed the Mysterians whom Ryoichi
had mentioned. Their only demands were a three-kilometer
strip of land and the right to marry Earth women.
One of the scientists, Joji Atsumi, was outraged
when he discovered that both his sister and girlfriend
were part of the first selected few.
After the meeting, the scientists agreed to declare
war on the Mysterians, upon coming to the realization
that they had already kidnapped a few of the Earth
women whom they desired. When the military began
the attack however, they were mostly destroyed
by the defenses near the Mysterian Dome. The extra-terrestrial
race flew around Tokyo, claiming they wished to
avert war, but warned that they would retaliate
if they are threatened. The United Nations came
to an agreement; they would have to work together
to defeat these aggressors. They built two ships
known as BETA-Class Aerial Battleships, which
were resistant to heat rays. The second assault
against the Mysterians began. When one of the
ships was annihilated by the overwhelming firepower
of the Mysterians' arsenal, another blow was dealt
to humankind. Following this tragedy, the Mysterians
upped their request to ten kilometers of land,
stating that if anyone were to enter the vicinity,
they would surely be decimated. Ryoichi, who had
willfully assimilated to the Mysterians due to
allure of their advanced technologies, soon discovered
that these people actually wished to rule the
Meanwhile, the Mysterians kidnapped Joji's girlfriend
and sister, and in response, he decided to infiltrate
the dome by himself. Finally, the humans enhanced
the surviving BETA Class ships with electron guns,
so their firepower would be at an ample strength
to weaken the dome. This assault would work in
conjunction with the arrival of powerful atomic
heat rays, known as the Markalite Cannons. With
a new plan of action finally concocted, the final
assault began. As the preparations were being
made, Joji slipped into the dome through a back
entrance. He procured a plasma rifle and used
stealth tactics to make his way deep into the
heart of the facility. When the Markalite Cannons
finally arrived on the battlefield, they began
their offensive immediately. The rays seemed to
work as the dome gradually weakened.
Meanwhile, the women aboard the Dome were freed
by a dissenting Ryoichi, as Joji continued to
delve deeper into the base. He fired at their
machinery, which further weakened the defenses
of the dome. Joji soon found himself in dire straits
however, as he was nearly killed by the guards.
Luckily, Ryoichi bailed him out just in time.
The captured women and Joji escaped, leaving Ryoichi,
who planned to sacrifice himself. He yelled one
final message to his friends, warning that humankind
should not become like the Mysterians and must
halt the reckless use of atomic weaponry.
As the humans escaped the dome, the Mysterians
warned the world to stop their assault, lest they
retaliate with even greater force. The humans
refused, so the Mysterians used their powers to
send a flood barreling into one of the Markalite
Cannons. The wall of water rushed across the countryside,
and an entire village was completely obliterated.
A second Moguera appeared underneath the other
Markalite Cannon, prepared to wreck havoc. Luckily,
it was crushed by the gargantuan weapon as it
fell to the ground.
Inside the dome, Ryoichi continued to destroy
more machinery as he noticed the scarred bodies
of his enemies. The extra-terrestrial leaders
evacuated as the BETA Class began to fire its
electron gun. Before Ryoichi can reach them however,
they were gone. Ryoichi walked off; he understood
he would not make it. The dome erupted in a massive
explosion. The BETA Class fired at a few of the
escaping UFOs, but many still managed to get away.
They docked with their Mothership and retreated
into space, for their destiny was clear. The Mysterians
would remain vagabonds of the universe, forever.