The island also contains vast amount of resources, allowing the three factions to create a near-limitless supply of giant robots for their respective armies.

The WSO has learned that the Gravity Curtain has reached an unstable status and will explode within 66 hours, destroying all of Earth and human life itself.

Knowing the danger of disabling the Gravity Curtain and combating the various factions, the WSO decides to send the Skull Force.

The Skull Force is divided into two squadrons - one of which is the 2 member-only Death Caprice Squad, composed of Ken Kaidou and Ryou Magami, pilots of the Mazinger called Mazinkaizer SKL.

Blades are also attached to the nozzle and beneath the handle of each handgun, allowing the Mazinkaizer SKL to slash at enemies up close.

When combined with the Wingle's Scrander the Wing Cross, SKL's limiter is released, allowing it to fight at full power, changing its eye color from blue to yellow, as well as unlocking a new set of weapons, which are variations of those from past Mazingers.

The Thor Hammer Breaker allows SKL to shoot a huge bolt of lightning towards its target from the Ganzantou, similar to Great Mazinger's Thunder Break.

The Wingle's design incorporates the female mechas used in the Mazinger franchise (Aphrodite A, Venus A & Minerva X) as well as elements of Devil Lady.

Like SKL, the Wingle also has a detachable cockpit on its head called the "Lady Falcon", which is piloted by Tsubasa in the anime, and Scarlet in the manga.

Its weapons include a pair of detachable blades that can be mounted on the arms or the legs and used as boomerang-type projectiles, as well as a flail stored in the left breast.

It is a green colored unit with horns shaped like a Crescent Moon on its head and shoulders, almost resembling a samurai warrior.

It rides a vehicle made of Caterpillar Tracks for faster transport and is equipped with two large cannons on the front, although they were never used in the anime.

A robot hidden within Garan's fortress, it is a secret weapon developed by the WSO and serves as one-half of the Gravity Curtain, having been powered by the same source - the Graviton Reactor.

The overall armored design of the Iron Kaiser is loosely based on Shuten Doji, a character from Go Nagai's manga of the same name and sports a red and gray metallic color.

It also has a Pilder attached to the robot's cranium, able to transform itself into a discus to slice off its target, similar to some of the enemy mechas found in Grendizer.

It is equipped with Beam Weapons for combat, as well as produce a barrier needed to protect the Hachiryokaku's home base from enemy attacks.

A mono-eyed mechanized head is used in place of a skull from the original Garada K7 and is given color schemes of purple and light green.