Technology & Combat Characteristics
The GRM Gundam was the prototype and the first mobile suit of the "GNZ Series" (also known as the "Ga Series") dedicated to the Innovades who call themselves Innovators. It was developed using design data of the Gundams within the quantum processing system, Veda, which was in the possession of the Innovator, Ribbons Almark, at that time. Interestingly, the development of the GRM Gundam did not utilize the Gundam Plutone's data directly, instead the data utilized was from the GNY-004B Gundam Plutone Black, a replica of the Plutone made by the Innovators.
The name "GRM" means "Generation of reborn MS", and while spelled differently, it was also named after "[https://en.wikipedia.org/wiki/Garmr Garm]", a hound in Norse mythology that watches over the dead in the underworld who are trying to return to the world of the living. The shapes of the GRM Gundam's limbs are also similar to the later GNZ series machines', with a major exception being the feet.
History
Sometime after the Innovades who call themselves Innovators were defeated by Celestial Being, Billy Katagiri met Robert Spacey for the first time. Robert immediately noticed Billy was carrying information on the new next generation mobile suit he was developing for the Earth Sphere Federation Forces (ESF Forces), and remarked that that was one of the things he wanted to discuss with Billy. Robert's words made Billy uneasy. Billy had assisted the Innovators in the past, and while working with them, he witnessed new technologies which proved beneficial to the development of the new ESF Forces mobile suit. Additionally, Billy did not want others to know that he had briefly cooperated with Celestial Being.
Robert noticed Billy's wariness and clarified that he was only interested in mobile suits, not Billy's past. He told Billy that he also assisted Celestial Being before, and thus in that regard, they both have similar checkered past. Billy's uneasiness was then quickly put to rest by Robert's innocent smile, and he later showed Robert a picture of a machine that the Innovators had developing using the data stored in Veda. Billy found that not only was Robert knowledgeable about mobile suits, he was also a good listener and asked pointed questions. Furthermore, he expressed child-like joy upon learning rare information. Billy then revealed that when he first boarded the Innovators' ship, Celestial Being, he saw a Gundam called GRM Gundam among the machines in the hangar. He explained that the GRM Gundam was the first of the Innovators' GNZ series of mobile suit, and that subsequent GNZ series machines lacked Gundam-like appearances so as to operate alongside the A-Laws.
All this made Robert wished he could take a look at the GRM Gundam with his own eyes. Robert then wondered if the GRM Gundam remained onboard Celestial Being. Billy replied that was likely the case as he could not see any reason for taking it out. He also added that the ship continued to be under surveillance by the Earth Sphere Federation, and as exploration of the ship's interior was ongoing, they should be able to find the GRM Gundam sooner or later. Robert remarked that he would be looking forward to it, and proceeded to probe further on what Billy had seen in the ship. Billy and Robert were so engrossed in their discussion on mobile suits that they paid no heed to the passage of time.
Prior to the Innovators' defeat, one of its members, Regene Regetta was identified by Leif Recitativo as one of the six Innovades that Veda wanted him to gather. Using the GRM Gundam, Regene arrived at an Orbital Elevator to meet the other five Innovades, including Leif. Regene was then awakened by one the five, Telicyra Herfi, and gifted with the power to control both the original GN Drives and the GN Drive Taus by Veda. To show off his new power, Regene started the GRM Gundam's GN Drive Tau from the outside by simply pointing at it. However to Regene's dismay, he soon learnt that Veda wanted the six Innovades to serve as the new Observers.
Finding this to be a poor use of his newfound power, Regene decided to eliminate the other five Innovades so as to gather new Innovades and form a group of Observers more receptive to his agenda. Leaving the other Innovades and the GRM Gundam behind, Regene contacted his accomplice, Beside Pain, to attack the Orbital Elevator with the CB-001.5 1.5 Gundam so as to kill the five Innovades. Unfortunately for Regene, one of the five, Hermiya, had the power to remove an Innovade from the group, wiping out all related memories and the special power granted by Veda in the process. With the other four Innovades agreeing to oust Regene, Hermiya activated her power, and Regene immediately forgot why he was at the Orbital Elevator.
With the ESF government adopting new peaceful and cooperative policies following the Innovators' defeat, Celestial Being stopped conducting large-scale armed interventions and instead took a more secretive approach to their actions. Additionally, the Ptolemaios team's Gundams were all badly damaged during the battle with the Innovators and new Gundams were still in development, limiting their capabilities. To fill the gap, Celestial Being's shadow support group, Fereshte, was revived and tasked with some of the armed intervention missions. Fereshte was assigned three Gundams: GN-006/SA Cherudim Gundam SAGA, GN-007/AL Arios Gundam Ascalon, and GRM Gundam.
The GRM Gundam was hidden in the Orbital Elevator, while the Cherudim Gundam SAGA was used for space operations and the Arios Gundam Ascalon for Earth-based operations. This division of the Gundams for use in different regions was because the enhanced surveillance network of the Earth Sphere Federation had made moving the Gundams almost impossible, although movements of Fereshte's personnel remain unhindered. The same applies for the Ptolemaios team. When the alien lifeform, ELS, arrived in the earth sphere, attracted by the quantum brainwaves, Fereshte decided to deploy the GRM Gundam to help defend Earth. While the ESF Forces were busy preparing the absolute defense line for the confrontation with the ELS, Fereshte stole a GN Drive Tau from a military facility in an Orbital Elevator and installed it in the GRM Gundam. Fereshte's Gundam Meister Leo Sieg then boarded the mobile suit and took a defensive position behind the absolute defense line.
As some ELS broke through the absolute defense line, Leo engaged them using the GRM Gundam. To his horror, he soon discovered the group of ELS was headed for one of the quantum brainwaves isolation facilities on the Orbital Elevator that was sheltering potential Innovators. To lure them away, Leo activated his quantum brainwaves and the ELS quickly went after him. Leo fought valiantly, but he and the GRM Gundam were eventually overwhelmed by three ELS GN-XIVs. As the GRM Gundam was being assimilated by the ELS, Leo maneuvered his mobile suit away from the Orbital Elevator. Just as the GRM Gundam was about to be fully assimilated, Setsuna F. Seiei teleported to the ELS home world using the GNT-0000 00 Qan[T], stopping the assimilation process. As a result, Leo became partially infused with the ELS and the GRM Gundam was turned into the GNZ-001E GRM Gundam E.