While staring into the night sky, Hotaru watches as one of the Garoga meteorites crashes to Earth. The next morning. the group set to investigate the crash site. While at the area, the group decides to split up and look for any traces that one of the Garoga monsters that might have been unleashed. Soon after, however, Joe is attacked by a toy airplane. When the individual controlling the machine finally reveals himself, Joe screams as to his intent with the toy plane. The duo is interrupted, though, when Hotaru and her brother arrive on the scene and immediately recognize the gentleman as being Sachio, a fellow citizen of Peace Land. Hikaru has his doubts, but Hotaru is more than happy to accept the fact that her closest childhood friend had survived that genocide of Baron Garoga.

The group returns home, where Sachio tells his amazing tale of how he had survived. How he was lucky enough to be on patrol in a spaceship the day the planet was attacked. Zone Father, like Hikaru, has visible doubts as to the man's story and leaves the table. Feeling brushed off, the rest of the family takes their new found friend about the country side to show him the sights. While traveling, the monster Wargilgar appears, prompting Earth’s hero to transform and battle the howling demon. Wargilgar, though, proves to be on par with the hero, as neither could get the upper hand on the other. That is until Sachio interferes, blasting the cackling monster with a ray gun. Stunned in disbelieve, Zone Fighter watches as the creature disappears, apparently killed by the attack.

After the battle, the team returns home, where Hotaru and her father discuss the turn of events. Claiming that there was no honesty in Sachio’s eyes, the elderly man tried to convince his daughter of the imposter's true intentions. However, Hotaru refuses to believe him, and storms out. The next morning, the whole family tries to make her see the light, yet the young girl still refuses to believe them. Instead, she runs to Sachio’s room, where she finds a note and a music box. Within the writing, her friend professed how much he would miss her and wrote that if she should miss him then to open the music box. Immediately the woman did as the paper instructed. Instantly the toy robots, tanks and aircraft spring to life and began to attack, blasting the control room and damaging the Zone Family’s machines. Realizing what she has done, Hotaru shuts the music box and ended the toys threat. Soon after, though, Sachio appears on the TV screen, laughing at the foolish Zone Family.

Deeply betrayed, Zone Angel runs to confront her friend as the monster Wargilgar begins to ransack Tokyo, despite the JSDF’s best attempts to stop it. Tanks and jets proved no match against the flame spewing monster. Meanwhile, transforming into Zone Fighter, Hikaru uses his Astral Dash and flies into the TV and straight to Tokyo. When arriving, he soon discovers his limitation. Plagued from a shoulder wound he received from the bloodthirsty toys, he was only able to battle with one arm. While the hero battled bravely, Hotaru confronted her old friend and was forced to shoot him. The man, however, rises from the ground and transforms into a Silver Garoga. This prompts the young woman to transform as well. Yet even as Zone Angel she could not overpower him. Fortunately, Zone Junior was not far away, and together the two gain the upper hand. Overtaken by rage, the alien casts them aside and transforms into Spyler, a huge mammoth size kaiju. Joining Wagilar, the pair tag team on the injured Zone Fighter. Meanwhile, Angel and Junior send out a transceiver robot to call for Godzilla's help. In no time, the nuclear leviathan arrives to answer the call, and soon turns the tide of the battle. Together the fighters of justice prevail, destroying the twin horrors of the Garoga empire.