Bebop and Rocksteady used to be human, and part of a street gang in New York City that was employed by Shredder. Rocksteady was originally a short and stocky blond Caucasian man (who sported army camouflage pants that would be replaced with simple beige pants later while also occasionally sporting an army helmet in his mutated form) while Bebop was a taller African American man with a purple mohawk. With other members of their gang, they were sent out to stop a Channel 6 reporter named April O&#039;Neil from doing a report about crime in the city. April ran down into the sewers while being chased by the street gang and met the Teenage Mutant Ninja Turtles, who defeated the gang in a fight.  After this humiliating setback, The Shredder developed a plan to defeat the Turtles by mutating members of this street gang, so that they would have abilities parallel to the Turtles&#039;. Bebop and Rocksteady both volunteered to undergo the procedure (though neither was particularly aware of what it would entail) with the promise that it would let them get revenge on the Turtles. Bebop was mutated into a human warthog, and Rocksteady into a rhinoceros. However, though the transformation did make them larger and stronger, they remained incompetent simpletons, and were completely inept at stopping the Turtles or carrying out Shredder&#039;s plans. For example, in &quot;Enter the Shredder&quot; they charged at the Turtles, who jumped, and crashed into each other. Donatello commented that their mutations didn&#039;t &quot;up their IQ&#039;s any.&quot; For most of the series they were employed for comic relief purposes. In one episode of the series, Bebop was shown to have kept a pet turtle, which got mutated into the evil turtle Slash.  

When the Teenage Mutant Ninja Turtles acquire Mutastones from Crys-Mu, the spirit of light, they acquire the ability to enhance themselves into Super Turtles for a duration of three minutes. Meanwhile, the evil Shredder and his minions Bebop and Rocksteady stumble upon the Dark Mutastone, which transforms them into Devil Shredder, Supermutant Bebop and Supermutant Rocksteady, respectively. But the Turtles have one more trick up their shells: all four of them can combine into their ultimate form - Turtle Saint.
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(Source: Anime News Network)

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In October 2019, he revealed that he has been diagnosed with amyotrophic lateral sclerosis (ALS). In February 2023, he posted on his blog an update to his condition, in which he is no longer able to move his arms or legs and was given a tracheotomy, losing his ability to speak (announcing his retirement from voice acting) but can still communicate with digital voice software.

A three-issue miniseries that featured the "TMNT Supermutants" Turtle toys that were on sale at the time. The first volume of the anime miniseries followed this storyline.

There have been a number of TMNT manga published in Japan which have never been released in the West.<br><br>
Mutant Turtles Gaiden is a collection of short stories drawn and written by Hiroshi Kanno and published by Dengeki Comics.