In Japan Known as Super Heavyweight God Gravion (超重神グラヴィオン Chōjūshin Guravion) The year is now 2041 AD. A new enemy called Zeravire suddenly appears in the solar system, destroying all military installations it comes across. However, a wealthy man named Klein Sandman is already aware of this planned invasion and had been secretly preparing his army for battle. His trump card is Gravion, a giant robot that utilizes gravity as its source of energy. Meanwhile a young man named Eiji secretly enters Sandman`s base in search for his missing sister. It is there that he meets another young man by the name of Toga... These two must now fight together with four other individuals aboard the super robot, Gravion to fend off the Zeravire threat.
While searching for his missing sister, Eiji Shigure secretly enters the castle of millionaire Klein Sandman. There he meets the castles strange inhabitants and is selected to join in Sandmans mission to stop a destructive alien known as the Zeravire. The teams weapon, a series of fighting robots designed by Sandman called the Gran Kaiser and the Gran Divas who when needed join together to form Gravion.
It's generic trip-to-the-hot-springs episode! Raven and Cookie have stayed behind though. At the springs, fanboy service comes fast and furious. Ena is a bit shy, but her towel is taken away anyway. Eiji relaxes in the men's bath when some of the maids enter. In escaping them, he falls over a cliff with only a section of fence to protect him. He ends up turning it into a tobogan. He crashes through the women's bath. Toga joins Eiji, thinking this is a fun game. They end up crashing at the bottom, where Toga ends up on top of G-Force's commander. After getting smacked by her, Toga spies Sandman talking to a man. Later, Mizuki and Alex are battling Luna and Ena in ping pong. Mizuki and Alex win. Mizuki has a deluxe package ticket, and Sandman shows up, saying it is his. He has Leele battle with him against Alex and Mizuki. Sandman runs all over his oppoents. Ironically, Leele wins it for them. That's when the Zerivire decide to attack. The Zerivire is using the lava of a volcano to charge itself. They have 90 seconds to drag the Zerivire out. To communicate this, Sandman orders the maids to give a karaoke performance. No matter whether you choose English or Japanese, their ability to harmonize is awful. While they sing, the Gravion kicks the Zerivire out of the volcano, and destroys it. In the end, Raven is the one who gets the special ticket.
Elji and the others suspect that Sandman is hiding something connected to the frequent Zelabaia attacks, and they sneak into the north tower of St. Germain Castle. There they discover the Sandman's mysterious past and the secrets behind the creation Gravion. Some of the mysteries behind Leele's birth are also unveiled, and when Toga tells her about it, she is so shocked that she throws herself into the Lake.
Sandman is keeping vigil on his daughter when the news comes: Toga's gone missing. Hugi has been watching this all this time, and gloats over this. It's going his way now. Eiji goes out after him. Back in the maintenence hangar, the maids are working around the clock to get Gravion back to fighting shape. Luna, meanwhile, has been captured by the EFA. They're analyzing her DNA for the Gravion data. meanwhile, Toga is hiding on the streets. Eiji enlists the help of his former classmates to find Toga. Meanwhile, the EFA goes public with their Gravion clone production team. The Zerivire attack an aircraft carrier. The EFA's Gravion is sent to stop it. The Zerivire rams the ship with the President on deck. Meanwhile, Sandman is suffering from self-doubts. Raven comes to confort him, and it doesn't help, that is, until Raven removes his mask... showing that he's really a she. She's really named Ayaka. She convinces Sandman to come back. (Although I have to wonder how Ayaka was able to hide that huge chest of hers in Raven's outfit.) Back at the fight, the EFA's Gravion has taken care of them. While the president goes on with endless blather, Toga is being attacked by two street punks. Faye comes in and saves him...
There's a new Gravion called sol Gravion. Zieg recognizes its power source as a device that decimated an alien race. It turns out the main pilot of the Sol Gravion is Ena. Ena tells us she's a clone of the original that died, but has all the memories of the original. The Zerivire apparently leave (yet another unexplained plot hole.) The Gravion team takes the Sol Gravion for a test spin. Sandman tells us that the Sol Gravion has the power to destroy the world - or create a new one. Eiji and Toga make up for their fight. Sandman frees Eiji, saying he has no obligations to Sandman anymore. Later Sandman talks to the President. The president pleads for continued support of Gravion. Then Sandman tells Raven that the true power behind Gravion Sol is the friendship and love that the team has for each other. Hugi then tells via a hologram that he will destroy earth in 48 hours. Some of Hugi's holograms attack Gravion. Then St. Germain castle takes off, shocking a lot of the maids on board. They form Sol Gravion, preparing for the final battle...
The newly formed Gravion faces off in their first battle against the Zeravire and the pilots discover their weaknesses. Meanwhile The Earth Federation Alliance plan their own attacks on the Zeravire.
The Zeravire have been evolving, not in order to destroy humans, but to ensure the destruction of Gravion. When the new and improved Zeravire comes to Earth to challenge Gravion, Sandman is hesitant to let the Gran Knights go to battle but they refuse to sit on the sidelines. With no other choice, Sandman must authorize the use of Gravions most adavanced weapon.
This is it, The final battle for the fate of the universe has begun as the Gran Knights and Sandman take on Hugi and the ulitmate Zeravire weapon. As the whole world looks on, our heroes must band together like never before to ensure the saftey of mankind. Win or lose, it is time for the end and time for goodbyes.
The Gran Knights and the rest of the castle take to space in order to take the battle to the Zeravire homeworld. It is the beginning of the final battle, where the fate of the universe will be decided.
Leele finally awakens from her coma. Eiji's out looking for Toga. Faye takes Toga to the orphanage where they grew up. It was sponsored by Sandman. She tells him that she resents him for taking her position as the Gravion's pilot. Faye tries to recruit Toga into the Grand Troopers. Just as he's about to give into her, Eiji arrives. At the Grand Troopers base, Mizuki finds Luna as the President arrives for a visit. Back with Eiji, he and Toga fight over things. Meanwhile, a Zerivire ship has appeared over the city. It creates a gateway where a bunch of Zerivire ships come from. At the Grand Troopers base, Mizuki and Luna run into the President. Mizuki takes care of the President's guards. The president recognizes Mizuki as one of his agents. they take off in a plane, and pick up Toga and Eiji on the way back to the base. Meanwhile, the Grand Trooper is fighting the ships. It isn't making much headway in the matter. Even though Leele has not regained consciousness yet, Toga takes her on his ship. (Yes, I know earlier I said she woke up; it's a slip in continuity.) In the battle, Thoria gets knocked out early. The Gravion robot is seized by a Zerivire, and drained of its energy. Then Sandman calls forth the flame planet. A lot of energy comes out and destroys a number of the Zerivire.
The Earthgultz members are worried about Leele. Toga in particular is berating himself becuase he always seems to hurt the people around him through his own carelessness and inability to understand their feelings. Zelabaia attacks while Toga is still upset, and his agitation keeps Gravion from functioning properly, making it flounder in battle.
The gravion gang goes to an amusement park Grand Island with some of the maids. There's a Zerivire there. Back at the base, the maids protest to Raven that they want to go to the park too. Back at the park, they can't find anything wrong initially. Leele laments that she doesn't have any memory of her past; the others tell her that she can simply make some by being with them. Leele and Toga are in a skyride by themselves, and Leele makes a move on Toga. Meanwhile, the maids at the base are still pleading to Raven to go to the park. Raven suggest that he have Mizuki buy the maids souvenirs. This only serves to make them angry. Mizuki and Eiji are in the haunted house. They take a sharp turn and suddenly find themselves in a part of the haunted house where the attacking images are real. Outside, a cute boy accidentally runs into Luna, and then turns into a Zerivire. Then other people in the park start turning into Zerivires. When things look hopeless, Eiji and Mizuki show up to help out. The Zerivires combine and start becoming bigger. Their targets are the pilots of the Gravion, as Sandman tells us. The Gravion ships show up and the pilots unite to form Gravion. Gravion defeats the Zerivire. Unfortunately, that was only part of the problem. The whole park was a Zerivire. This Zerivire attacks the Gravion and infiltrates it. It seems particularlly interested in Leele. Leele screams at the sight of a Zerivire eye in her cockpit, and then suddenly, the Zerivire disintigrates. Leele collapses, saying she remembers her past, and she is a Zerivire. We are left with a shot of Sandman laughing at the base...
At the EFA's underwater energy base, something is attacking it. They ask Gravion to investigate. Leele goes there, and they lose contact with her. The others investigate. Eiji takes Una's place. The Zerivire attacks at this point. Toga finds Leele and rescues her, only to be confronted by some mini-Zerivire. Toga forces Leele into another room while he battles the Zerivire alone. Meanwhile, just as things were looking hopless outside, the rest of the Gravion arrives. Eiji finds Toga lying on the ground, with his head in Leele's lap. After the rescue, Gravion is formed and then attacks the Zerivire. Toga has lost his sight due to lack of oxygen. However, Leele goes to him and guides his hands. Later on, Toga recovers at the base.
The gang surfs the interenet and visits Gravion's web site. Every page is "under construction" except for a headquarters map, which looks like a 3-year-old drew it. The maids blame Eiji. Four people are wandering the mansion grounds. They're spotted by security, and recognized by one of them. Sandman and Cookie go out to greet them. They people were there to see Eiji. Eiji, meanwhile, is working out. He then stops to visit the people. They turn out to be old friends of his. The maids then take Eiji's classmates on a tour of the castle. At the end of it, Sandman announces he's treating the guests to a picnic. While there, the maids show the guests some home movies of Eiji. They show him in drag, and being a pervert, etc. X then gets drunk and starts acting that way. She tempts Raven with some beer, but he refuses initially. Later he gets drunk with them. Two of the guests are in the driller, and one of them accidentally turns it on. The driller goes out of control, taking the guests with them. The rest of the Gravion team goes after it. Sandman manages to get on board it and reset the driller, ending its rampage. They combine into Gravion. The president has discovered an 18th century picture of a man named Count Saint-Germain. The Count looks a lot like Sandman, and was rumored to be able to travel in time as well.
The Gravion team completes another mission, mucht to the delight of the president. Someone says the Zerevie are going to return at any moment. The team is made to be maids, due to a strip mah jongg game that got out of control. They are forced to cook, clean, do the laundry, repair robots, and more. Eiji is forced to wear a dress. Meanwhile, Mr. Sandman is meeting with someone elsewhere. Back at the mansion, Luna shows off Toga's room when he was a child to Eiji. Then the G-alert sounds. The Grand Knights go to intercept the intruder. After much destruction, they decide to combine, but cannot. He's stuck in a subway. After trashing a street punk, Sandman shows up and lets them combine into Gravion. A lot of chaos and distruction ensues, ending with the Zerieve being destroyed. Elsewhere, some generic sinister people are plotting to reshape the earth...
The battle wages on as Gravion fights against the attacking Zeravire with a failing auto-pilot and Eiji and Leele still missing. But after his friend Yumi is injured in the attack, Eiji decides that his place is with the rest of the Gran Knights on Gravion.
After seeing what darkness Toga is capable of in the heat of battle, Eiji quits the Gran Knights and leaves the castle to return to a normal life. Leele ventures to town to convince Eiji to come back. Two pilots down, Gravion must operate with its auto-pilot taking up the slack when the Zeravire attack.
Following recent events, Sandman reluctantly has an auto-pilot device, The Gran Phantom intstalled into the Gran Kaiser in case of emergency. And one does arise when a Zeravire with a nuclear power supply attacks and one of the maids is put in danger, causing Eiji to try and rescue her while the rest of the Gran Knights use the system and go into battle with out him.
Repairs begin on the castle following the attack by the Zeravire and Eiji begins to recover from his battle but runs from his physical and runs into Mizuki who gives him insight to the disappearance of his sister Ayaka. Together they decide to investigate where she vanished, the West Tower.
When the Zeravire attacks the the castle, all hope of stopping it lies with Eiji, who has accidentally found himself piloting the Gran Kaiser. To survive he must call upon all the power of the Gran Kaiser and all that his body can withstand.
On the anniversary of her father Isanas death, Luna returns home to the island of Okiaowa but is surpirsed when she finds that the rest of of the Gran Knights have decided to accompany her to the have some fun on the island. But all fun is soon ended when the Zeravire target the International Peace Conference for their next attack.
Eiji begins to get used to life in Sandman's castle and to the castles inhabitants. As he and Toga venture to the forbidden area of the castle in search of Eiji's sister Ayaka and the identity of the G-Shadow's pilot, Raven attempts to convince the EFA to allow Earthgertz to take the lead in the defense against the Zeravire.
When a ghostly figure is sighted in one of the castle's towers, Toga and Eiji go to investigate. There they discover Leele, the mysterious pilot of the G-Shadow.
In an effort to get to know each other better, the team goes on a picnic together but Leele is hesitant to share as she is haunted by nightmares of her past. Meanwhile the EFA attempts to find information of Sandman.
Eiji sneaks out of the castle during the staffs shopping day and takes Toga along with him for his first day out of the castle and his first day in the big city. As the maids search for them, the Zeravire launch an attack on the city.
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