Doctor Shreddarius is the Shredder's counterpart in the world of Super Turtles in the Mirage Comics. He is the main antagonist of the Super Turtles Arc and the unseen overarching antagonist of the 2003 Teenage Mutant Ninja Turtles episode," Reality Check" since he didn't appear in person but his Terrorkinetics appear in as training hologram, implys they did exist as well as Doctor Shreddarius. He created the army of the terrorkinetics to protect Earth, but ended up double-crossing his partner Lucks. While in his lab, he was gravely injured from experimenting with chemicals. A rat was mutated from licking Shreddarius's chemical wounds. He is named Sliver, and is the counterpart to Master Splinter. Unlike Master Splinter, Sliver is evil because of his loyalty to Shreddarius.
Shreddarius is rebuilt as a cyborg. His friendship with Lucks grows along with their political relationship. Their only goal is to control the world, but their plot is soon revealed by Jonas Case and Neil O'Malley, scientists who once worked for Shreddarius. Jonas and Neil lead a rebellion along with the Super Turtles to stop Lucks, Shreddarius, and Sliver. While the Super Turtles defeat their master, Shreddarius escapes to fight another day. Lucks is now behind bars and the Super Turtles announce that the nations leaders now have control once again of their countries. The Super Turtles do eventually beat Shreddarius and the terrorkinetics.
Although Shreddarius doesn't appear in any TMNT, the Shredder from the 2014 film does wear an exoskeleton on his armor similar to what Shreddarius wears while the film have some plot elements similar to the Super Turtles history.
He is similar to Darth Vader from the Star Wars Franchise as both are cyborgs, both are fathers, both wear capes, both created things for their own means and both seeked to turn the heroes to the darkside.
Shreddarius is similar to Emperor Palpatine from the Star Wars Franchise as both are powerful villains, both seek domination over a particular area and both turned a father of the heroes to the darkside.