Shin Getter Robo (真ゲッターロボ) (usually called Shin Getter for short) was created by Banpresto for Super Robot Wars 4, a game released for the Super Famicon (also known as the Super Nintendo) game console. The concept was to give the Getter team a stronger machine for later stages of the game. Banpresto contacted Go Nagai and pitched the idea to him, and he agreed to come up with the new machine. Nagai liked the design so much that he adopted it into multiple Getter Robo universes' storylines.

In Getter Robo Armageddon, Shin Getter is Professor Saotome's ultimate creation during the prologue of the story. After breaking through a group of mass-produced Getter Robo Gs, Ryoma Nagare and Hayato Jin find it inside the Saotome Laboratory along with Go "Saotome", the professor's genetically engineered "son". When the trio learns that the military has launched a nuclear warhead at the newly-formed Shin Dragon, they use Shin Getter in an attempt to stop the attack, but ultimately fail, causing a Getter Ray contamination that kills most of the planet's population. Several years later, when the story picks up again, Shin Getter is piloted by Go, Kei Kuruma (Getter teammate Benkei Kuruma's adopted daughter) and Gai. They use Shin Getter until Shin Dragon joins them willingly to fight the Invaders, at which point Ryoma, Hayato and Benkei take up the piloting duties for Shin Getter. The two Getters combine their energy to create incredible attacks, capable of destroying Jupiter and its Invader-infected moons, but Shin Getter ends up stranded in another dimension, fighting alongside Getters from other universes for all eternity. (Wikipedia)