|“||WHAT! You tried to destroy the dimensions we've been trying to mutate for thousands of years!!? (Krang: Well, you did say to wipe out the turtles at all costs) This is why I banished you to "Dude Dimension X", BECAUSE YOU'RE AN IDIOT! A MORON! A DINGLEBERRY! SO YOU KNOW WHAT? I'M SENDIN' YOU BACK!||„|
|~ Kraang Subprime to Krang after he learned his plan to wipe out the Earth in every dimension|
|“||WIPE OUT THE LAIR!, but the rat comes with us!.||„|
|~ Kraang Sub-Prime|
Kraang Subprime (formerly known as Knight) is a Master Kraang Spy and second in command of the Kraang. He was sent disguised as Irma Langinstein to spy on April O'Neil.
Irma dresses in a Gothic style of clothing. She has black hair, which is cut short and has purple streaks. She wears bracelets on both of her wrists, a black tank top with a checkered pattern skirt, large boots that go up her calves and red oval-shaped glasses. She is slightly shorter than April.
He has a left cyber-optic eyepiece a prosthetic claw in his front left tentacle, a scar across his face and a blue tattoo around his right eye.
His exosuit is much taller and wider than his brethren, and retains vestiges of Irma's "body", such as her head and arms. The head can detach and grow spider-like legs.
Mousers Attack!: Irma made a cameo on April's caller ID prior to her first in-person appearance,
Mutagen Man Unleashed: Irma makes her first in person appearance here, she is shown at her locker but her face cannot be seen and she has no speaking role.
The Good, The Bad and Casey Jones]: Irma makes her first speaking appearance in this episode. She is shown as April's best friend, walking with her in the hall. She asks Casey where he got his bruises, and doesn't seem to like April hanging around him.
Of Rats and Men Irma played a larger role in this episode. She was kidnapped and put into a cage along side Casey Jones. The Rat King wanted to test the mutagen on her first to create his army.
Pizza Face Irma appears hanging out with April, about to see a zombie movie when her friend get a call from her T-Phone. She didn't believe the "dating with Casey" excuse, she already knew that April has some secret friends that she don't tell about. They both get hit by a pizza guy's bike, who exclaimed that he's being attacked. He leaves a pizza box, which April get it for the guys and run off. It made Irma feel bad because her friend ditched her again with no honest reason.
The Wrath of Tiger Claw Irma is hanging out with April and Casey (who complains about her being a third wheel and it being a ruined date) after seeing a movie. April then senses Tiger Claw and Karai who are following them. April (who is being chased by Karai) and Casey (who gets ambushed by Tiger Claw) split up to deal with them leaving Irma confused and frustrated with the both of them and unaware of the situation.
A Chinatown Ghost Story Irma and April are captured by Ho Chan because he needed April's powers. He also says Irma has powers, but he doesn't know which one.
After being ambushed by Foot-Bots in The Invasion, Part 1, a panicked April takes Irma to the Turtles' Lair. There, Irma's body begins to split apart and reveals to be the android body of Kraang Subprime, the Kraang second-in-command and a master spy. He opens portals, allowing other Kraang into the lair. The lair becomes ruined in the scuffle, and the Turtles and April are forced to retreat while Splinter holds off the invasion. Kraang Subprime is defeated when a piece of the burning lair falls on top of him.
He returns in Battle For New York. The Mighty Mutanimals attack him and the other Kraang, but he launches a rocket that is filled with mutagen, so he can mutate the world. He followed The Turtles into Dimension X. He tries to destroy them. When the turtles got into a Kraang ship, he told the other Kraang to unleash the Dracodroid. The Turtles got away from the Dracodroid. T Kraang Subprime got into the ship and tried to destroy The Turtles, but The Turtles were teleported back to earth by The Mighty Mutanimals. The ship crashed into a Technodrome and exploded.
He returns in Annihilation Earth Part 1 where he is once again alive and was trying to fix the Technodrome with Kraang Prime but failed, later he did succeed in the second time were the turtles and Leatherhead are captured, just before they could start their Invasion the Triceratons then appeared and destroyed the Technodrome with him and Kraang Prime in it.
The War for Dimension X: Subprime is shown at a gathering with the Salamandrians to attack the Triceratons, until they mention the Turtles which prompts him to capture them. later, he discovers the location of the Utrom base and attacks kidnapping their leader, Queen. he is then cornered in his base until he unleashes a Dracodroid on them which then evolves into an all out battle between the Utrom and the Kraang. he then attacks Bishop in a duel which ends with Subprime seemingly meeting a fiery end at the hands of his own Dracodroid.
Trans-Dimensional Turtles: Kraang Sub-Prime hacks into Donatello's portal ray, sending them to Krang's Technodrome. It was there that it was revealed that he and Krang are cousins, and apologized for banishing him to the 2D earth of the 1987 ninja turtles. After the collective turtles make short work of their Kraangdroids, he and Krang follow them to the 2D earth to try and stop them. They then teleport back to the Technodrome, where once again the turtles fight and defeat Sub-Prime's forces. Shortly after, the turtles reveal the that the dimensionizer would've destroyed the realities that the Kraang have been trying to mutate for thousands of years, something Sub-Prime had no idea of. He chastises Krang for his insanity and stupidity, and banishes him back to the world of the 1987 ninja turtles, shortly before the turtles defeat him and send him to the Prime Turtle dimension.