After their battle against the Hyakki Empire, Michiru secretly drew up designs for a new Getter Robo unit to use in case of an emergency. However, as they were in relatively peaceful times aside from the occasional battle, along with the assistance of the Mazinger Team, she shelved the idea for the time being.
Season 2 Edit
One night, Star and Asuka caught Michiru making small adjustments to Shin Getter's blueprints, where she was seeing about adding abilities from some of the other Knights to its arsenal. Flustered by them peeking in on her work and looking the plans over, she asked them not to tell the others just yet, as this was still a secret project.
During the Knights' battle against OZ, and after Tetsuya and Great Mazinger were incapacitated and Starscream nearly dying thanks to their new Gundam Epyon, Michiru decided to finally present Shin Getter's plans (also thanks to Star and Asuka's insistence). Believing it might be their last resort, the team set out to construct it at once. After several weeks, Shin Getter was finally completed. All that was left was to pump it full of Getter Rays and start it up. Unfortunately, OZ had caught onto their operation as Benson, in the Gundam Epyon, and a squadron of Taurus Mobile Suits came to launched a surprise attack. Hayato and Michiru insisted that Ryoma stay to get Shin Getter moving once it was fueled up. After a surprise infiltration of OZ troops, Benson busted inside of the hanger to stop the but Asuka intervened, desperate to protect her friend. With Epyon destroyed her Getter One, and Asuka screaming "I don't want to die!", Ryoma's anger finally triggered a reaction from the Getter Rays in Shin's system, triggering it to finally activate.
Season 3 Edit
When the rest of the team went to Mewni to assist Star, Pink Diamond had the Getter Team and some others stay behind to watch over the base, with Ryoma reassuring her that Shin Getter could handle anything that came their way.
Shin Getter 1 Edit
Pilot: Ryoma Nagare
Getter Battle Wing: Instead of a cape like most Getter Robo's, Shin Getter One ejects a pair of bat-like wings from its back for flight. They can also fold inwards around its arms to accelerate upwards even faster.
Getter Tomahawk: Unlike other Getter Tomahawks, Shin Getter One's takes the form of a large lance that has to be held by both hands.
Getter Beam: Shin Getter One is able to fire two variations of the Getter Beam; a small, green one from its forehead (similarly to Getter Dragon) and a large, pink one from a hole that opens in its stomach (similarly to the original Getter One).
Shin Shine Spark: Upgraded version of the Shine Spark:
Shin Getter 2 Edit
Pilot: Hayato Jin
Drill Missile: Like the original Getter Two, Shin Getter Two can launch its drill from its arm directly at its opponent.
Plasma Drill Hurricane: Shin Getter Two generates a strong whirlwind from its drill that can either simply paralyze its opponent or tear them to pieces.
Shin Getter 3 Edit
Pilot: Michiru Saotome
Getter Punch: Shin Getter Three can fire one of its extendable arms at its opponent, either wrap the arm around them or punch right through them, charge forward, then punch them with its free arm.
Daisetsuzan Oroshi: Like the original Getter Three, Shin Getter Three launches both of its extendable arms towards its opponent, wrap them up, then release them into the air . In Shin Three's case though, its arms can spin so fast that it creates a tornado.
Getter Missile: Shin Getter Three can launch four missiles from the ports on the shoulders.