Ambassador Magma is a golden human rocket created to defent the planet Earth. Goa, an old foe that Magma had defeated has awadened from dormancy and attempts to capture the planet Earth again. To keep Earth safe from the hands of Goa, Magma has been reawakened to watch over the planet.
Fumiaki Asuka and his daughter Miki are keepers of Goa and Ambassador Magma's spirits. After Fumiaki is captured by aliens and releases Goa's spirit, Miki is pursued and finds protection in Atsushi Murakami's house. She discovers the true purpose of her life and must decide what to do
Goa's atteépts to capture Miki fail and Ambassador Magma returns to Earth. However, this does not stop Goa's plan for conquest and he sends humanoid creatures quietly to begin his plan. Mamoru meets with the protector of the Earth and gains insight into Goa and Magma.
As Atsushi and Junya try to uncover evidence of Goa's existence, a mysterious stranger appears. Mamoru and Tomoko are attacked by a savage canine and must fight to stay alive.
Determined to find "EARTH", Goa captures Mamoru and sends one of his creatures to terrorize Atsushi and Junya
The Defense Intelligence Agency (D.I.A) is eager to discover what the aliens plan for planet Earth. Meanwhile, Mamoru is attacked by a creature but receives help from "Earth's2 ney rocket-humanoid assistant Gamu...
Acting on the advice of his father, Mamoru assists Kunisaki at the Defence Intelligence Agency (D.I.A.) The governéent is convinced that Ambassador Magma is responsible for a dedly tsunamy created by Goa, but believing in Magma's innocence Mamoru risks his life to help a friend.
While Searching for Onitono shrine Atsushi and Sekita find a girl that may lead them to Goa. As Mamoru and Umemura investigate a government installation, they are abducted by Udo, a deadly being.
Goa's evil assistant Jagobu sends alien assassins to retrieve Mamoru's mystic whistle. In a desperate fight for life Mamoru and his mother vanquish one of the alien menaces with the help of Mr Imai, a new friend. Believing they are safe, Mamoru and Tomoko accepts Mr Imai's invitation to a barbecue. There they meet Midori, the Imai's only daughter who makes Tomoko very uncomfortable. When Hilda crashes the barbecue looking for the whistle, she reveals a secret that shocks everyone.
Mamoru blames Goa for the deaths of those that vere close to him. When it appears that his mother may be the next target, he decides to go after the evil Goa. finding an ominous cave under a questionable shrine. Mamoru, the intelligence bureau and Gamu face off against the newly resurrected Udo.
When Mamorus' life is threatened, he is saved by a guardian angel. Discovering the identity of his rescuer, Mamoru becomes confused and enraged. When Udo uses Atsushi, Sekido and Umemura as bartering tools to capture Magma, the stranger appears again.
Along with the battling Ambassador Magma and Udo a group of people are transported back in time. While the two titans clash, Magma is aided by a former opponent. A temporal distortion with a path returning back to their period appears, but will everyone be able to return?