Super Rocksteady and Mighty Bebop

Super Rocksteady & Mighty Bebop are two robotic version of Bebop and Rocksteady created by Kraang to replace them.

Biography
After Bebop and Rocksteady failed once again on their mission to place a mesmerizer on Channel Six's tower to turn hypnotize all the humans in the world into Shredder's minions, Shredder and Krang straps Bebop and Rocksteady to a device that creates two robotic versions of them. Krang notes that they are smarter and stronger than Bebop and Rocksteady ever hoped to be as the two robots tossed their original selves aside. This pleases Shredder as he plans to take Super Rocksteady & Mighty Bebop to Channel Six with the mesmerizer. Unbeknowst to Shredder is that the mesmerizer has been damaged from Bebop and Rocksteady's mission, which Bebop and Rocksteady knew all along but kept quiet about it.

As Shredder arrives at Channel Six with Super Rocksteady & Mighty Bebop, he orders the two robots to guard the lobby and stop the turtles. Super Rocksteady & Mighty Bebop agreed as they said they'll stomp on the turtles, which Shredder notes it as a good idea. Shredder then gets to the top of the building and places the mesmerizer upon the radio antenna. However, the mesmerizer instead made all humans act like children, which the turtles notices and rushes over to Channel Six news station, where they cross paths with Super Rocksteady & Mighty Bebop.