Kraang Subprime is an Utrom turncoat and enemy of the Teenage Mutant Ninja Turtles with a robotic left eye, a huge scar, a blue tattoo across his right eye, and a robotic claw on his left front tentacle. Serving as the Kraang's master spy, being the only one among them to fully master the human language, Subprime poses as Irma Langinstein (voiced by Kate Micucci), April O'Neil's best friend in high school. Prior to joining the Kraang willingly and revealed to be Bishop's brother as well as a hero among their kind, Subprime was originally known as Knight. It was also revealed that he is related to Krang from the 1987–1996 animated Teenage Mutant Ninja Turtles series.