The sequel to SD Gundam Gaiden Seikihei Monogatari, SD Gundam Gaiden: Kikoushin Densetsu (SDガンダム外伝 機甲神伝説) is a Cardass series in the Knight Gundam series released in 1993, as well as the last entry in the original SD Gundam Gaiden series, ending the overarching plot started in SD Gundam Gaiden: Sieg Zeon Hen.
Three years after the events of Seikihei Mongatari, a new evil empire called the Delaz Kingdom. The only hope left is in the hands of the amnesiac Neo Gundam and the six powerful Kikoshin that are connected to his past.
Similar to the Kihei from the last story, the "Kikoshin" are giant mechanical robots, and the story's characters are Mobile Suit Gundam Silhouette Formula 91 in UC 0123 and Mobile Suit Gundam 0083: Stardust Memory and, interestingly enough, God Mars. The story also takes inspiration from both the latter and Sailor Moon.
The series was also adapted into the 2010 mobile game alongside Seikihei Monogatari in the mobile game Seikihei to Kikoushin.
Tropes associated with SD Gundam Gaiden: Kikoushin Densetsu are:
- Adapted Out: Mage Fencer Meteor Gundam, a significant party member in the Carddass and game versions, and Tactician Quattro/Knight Char, who played a role in the final battle against Sieg Zeon, are both MIA in the manga.
- Amnesiac Hero: Neo Gundam, who has no memory of his past except for his name.
- Bad Moon Rising: The moon turns red in the fourth chapter of the work due to Sieg Zeon's power. Oh, and it's also falling out of the sky straight towards Saddrac.
- Brainwashed and Crazy: Happens to Luna Gundam via King Aiguille (possessed by Sieg Zeon) which caused him to fight Neo Gundam.
- Combining Mecha: Gungenesis, the True Armor God that is formed by the combination of the 6 Armor Gods. When Chaosgaia is the core mecha, they become Gungenocider.
- Expy: There are several in this series. For example, Neo Gundam himself is one to Takeru Myojin, as they are both psychics who control a group of Combining Mecha.
- Luna Gundam is one to Marg, in their relation to the main protagonist, acting as The Mole within the main villain's forces, becoming Brainwashed and Crazy, ultimatly dying from it, and guiding the lead as a spirit after their death.
- Heroic Sacrifice: Luna Gundam's soul does this in the manga to prevent Sieg Mabuze from disappearing into the atmosphere.
- Hijacked by Ganon: The first two arcs set up the main villain to be either Atomic Gundam or King Aiguille until Atomic Gundam's evil shield breaks and King Aiguille is possessed by the true main villian, Sieg Zeon.
- Humongous Mecha: The Kikoshin which, like the Kihei, are large machine soldiers that can be piloted by the SD Gundams. Note that this is only true for Elgaia and Arteia/Chaosgaia, the remaining five Armor Gods appear to move on their own.
- Late-Arrival Spoiler: As the work is considered a sequel to SD Gundam Gaiden Seikihei Monogatari, there are several for that series including the fate of Gunrex and the existence of Atomic Gundam.
- Luke, I Am Your Father: In addition to Masked Knight, a knight working with the Delaz Kingdom, and Rose Knight, Neo's Mysterious Protector, being the same person, it is also revealed that he is Luna Gundam, Neo's older twin brother.
- Mind Rape: Happens to both Neo and Luna in the manga. Luna Gundam telepathically guided him to the location of the last Armor God and is brainwashed via this by King Aiguille (actually Sieg Zeon). Of course, the telepathy transferred the shocks over to Neo...Neo: Uwaaah!! What's this shock...! M-My head's about to break!!
- Multiple Endings: The game adaption of the work, Seikihei to Kikoushin, is notable for being the only Knight Gundam game to have two slightly different endings depending on what choice the player makes when Gungenocider activates its self destruct program.
- Mysterious Protector: Rose Knight, just like his God Mars counterpart, is one for Neo Gundam.
- Twin Telepathy: Neo and Luna are seen having this in the manga.
