"Those who are not with me are against me! And I crush anyone who stands against me!"

Shredder (The Shredder Strikes, Part 1)

Oroku Saki, a.k.a. Shredder, is the master of ninjutsu and the evil leader of the Foot Clan. He is a fictional character and a frequently villain from Teenage Mutant Ninja Turtles. He is the archenemy of Master Splinter for killing Hamato Yoshi as well as the enemy of the Turtles.

He also the foster father of the Ultimate Defender member, Karai.

The Shredder is known to be cruel, violent, sadistic and power hungry. He despises those who gets in his way. He wears a samurai-like armor adding to his cruel look.

Four people have been known to wear the mantle of the Shredder. One is the Utrom convict named Ch'rell. The second is Karai.

The Shredder

The third is a digital villain Viral who became "Cyber Shredder". The third is the demonic Tengu Shredder.
Exo Suit Shredder

The Shredder in his Exo suit with and without battle armor

In "Rise of the Shredder Part 1", he lead the Foot ninjas to attack Nexus, easily defeated the Ultimate Defenders and brutaly wounded Vegeta and Ethan, before he can make the finishing blow on Ethan. Karai had appeared and escaping with the wounded heroes.